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Published:
2025-06-30
Updated:
2025-10-06
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16/30
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The Rules of Engagement.

Summary:

Saiki Kusuo is a good person. Push aside his lukewarm and apprehensive attitude, he's a decent human being. He tries to stay out of trouble; and thanks to his mom, has a strong moral code.

 

What happens when a shameless, reckless, and vicious boy, who lives knee-deep in Japan's homelessness and prostitution, wasn't as cruel as Saiki Kusuo made him out to be?

 

What if said boy was quickly running out of time and Saiki Kusuo, with all his powers, couldn't help.

 

Haha, jk, unless… 

Chapter 1: Mumei Kyousuke

Chapter Text

Maybe he shouldn't have stolen that 100¥ chicken from the Conveni. 

 

Kyousuke lands against the black pavement with a loud thump, taking a handful of deep breaths before continuing to run down the streets of Hidari Wakibara. 

 

The police were doing too much! 

 

Was steeling two pieces of fucking chicken really that big of a crime that worented six police officers chasing a blonde teenager down three blocks? 

 

“Stop running, kid!!” The pig squeals. 

 

“Goddamnit- Fucking- Ugh!!” He gasps for breath, tripping on his feet, falling on his ass, scraping his hands; quickly coming up, he looks around the dead end before climbing up the brick fence. 

 

The blonde lands with a thud, gasping sharply, crawling towards the bush, worming his way in between the branches as he tries to calm his racing heart. A few seconds go by, he could hear the police mutter just on the other side of the fence. 

 

He'll wait, it can't be that long-

 

Twenty-four minutes later they are still there, yapping like they don't have places to be, people to see, food to eat. 

 

Ugh, this would take forever. 

 

Kyousuke pushes his lengthy body out the rose bush, looking around the half-empty backyard, towards the clothesline, next to what seemed to be other cute girls clothes, was a blazer and skirt uniform- A ugly uniform, it's this nasty shade of green, with black stripes. 

 

His golden ticket!!

 

He quickly strips out of his old, well-worn clothes, shoving them into his backpack, slipping into the ugly uniform. tucking his greasy, unwashed hair behind his ear before slipping his chunky platform boots on. 

 

Did he seriously have to pretend to be a high-schooler just ‘cause some shitty cops were on his ass? He swore to never go back to high school, life was so cruel! 

 

On the other side of the fence, Kyousuke could hear other teenagers talking in loud goofy voices, walking to school in the little packs they made. 

 

He cringed internally, hating everything that is about to happen with every fiber of his body, but it's better than going to jail, right? 

 

Right?  

 

With a deep breath he climbs over the wall, falling on his hands and knees, cutting up his palms. “Fuck, that fucking hurt!” He yelps, shutting his eyes as pain snaps up his spine. 

 

“Hey, buddy? You alright?” Someone with a gruffy voice is calling out for him, pulling him onto his feet. His body protests, whining softly. “You fell like a sack of potatoes, sounded like you broke something.” 

 

“Fuck- No, no, I'm fine.” He slumps against the wall, cracking his eyes open- “Holly shit-

 

“What?” The mountain of a man asks, twisting his face into something straight from a horror movie. “You need me to call someone for you, buddy?”  

 

“Too close.” Kyousuke presses against the wall, still clearly out of breath. “Um, look, buddy, I'm fine. You should get going, you don't want to get fired from your job-

 

“Are you joking? We go to PK- See, we have the same uniform on.” The man- No, the teenager says, leaning down, placing his colossal hand around Kyousuke's injured shoulder. “We should walk together.” 

 

We should walk together. 

 

We should walk together.  

 

They walked together- 

 

He was dumb, Nendo was so fucking dumb. No drug in the world had made him feel this brain-dead. All he did was talk about Ramen, which made Kyousuke's already hungry stomach growl, embarrassingly loud. 

 

As soon as they walk into the generic looking high school, Kyousuke breaks loose. Taking the opportunity this pink haired guy gave him to squirm into the crowd, disappearing in between the washed-out people. 

 

He's going to leave PK, turn the page on this weird-ass day and never look back, but, to his rotten luck, the cops are outside the gates, talking to his mean looking teacher. Y'know, one day of class won't hurt him. Except he doesn't actually belong to this school, he's a fucking poser, a poser that will probably go to jail if he's caught. 

 

“It's Teruhashi-san!!” Walking past the obnoxiously loud group of guys, Kyousuke wanders the halls, ending up at the infirmary. His safe point. It's empty, silent and warm. A rotten smile spreads across his face, looking around the room in wonder: looking in the drawers, turning the faucet on-and-off a few times, fluffing the bed in the corner of the room.

 

He's in love!! 

 

“The universe is finally shining above me!” Giggles the blonde, cracking the window open, lighting a cigarette, taking a long satisfying puff, melting at the nicotine running throughout his lengthy body. 

 

Kyousuke rummages through the room a bit more, pocketing a handful of bandages, really making himself at home, drawing the curtains and throwing the blanket over his body.

 

He would take a long nap-

 

"Huh, is the nurse dead too?” No, no, no, no, no, no! It's that dumb fucking kid from earlier. “That's weird. Guess I'll have to do mouth to mouth on you, myself."

 

Uagh, the universe still fucking hates him!

 

Kyousuke pouts, crossing his legs underneath his body, glaring at the curtain in front of him, cursing under his breath when something bangs against the bed, swaying the curtain violently. 

 

What the hell was that? 

 

What the fuck was happening? 

 

The sound of running water fills the tiny room.  "I don't need mouth to mouth, you stupid idiot!" Something about this entire situation bothers the blonde- And if Nendo was stupid? It didn't give him the right to be such a dick, gargling like a maniac. The sound was so gross. Was he trying to drown himself, or was he throwing up? Hum, it kind of reminds him of the episode of Spongebob™ where he stays with Patrick, and the star is gargling in his sleep, yelling about spiders.

 

"You're better?” Are they still talking? He really needs to stop ignoring people when they talk. “Well, that's nice to see.”

 

"Of course, I'm better! I was faking it!!" Oh, plot twist. "Wasn't worth it, though! Since I got kissed by you!"

 

"Well, if it makes you feel better, I'm sad too. You were my first kiss." And the plot thickens.

 

"Now, everyone's gonna think Nendo and I are… Lovers." Mystery voice number one was so dramatic, probably draping over a Victorian fainting sofa and a vial to catch his tears. He sounds so punchable. He needs to calm down, an elevated heart rate will kill you faster, y'know-

 

"Hey, you better not tell anyone my fainting spell was a fake!" Someone shuffles across the room, sounding rather annoyed- It could never compare to the bitter rage simmering in Kyousuke's greedy little heart. 

 

What gave them the right to walk in here and rob him of his precious nap?

 

Jerking the curtain back, Kyousuke glares at the three unfortunate souls standing before him. His eyes sharpen down to vicious slits, focusing on the furthest of the three, the green haired loser.  

 

The one with the grainy, high-pitched, annoying voice. 

 

"Oi." His voice is rough from his premature sleep, irritated, yet smooth like silk. “This is the infirmary, if your not sick then you should fuck off.” A pair of heavy platform boots, clank harshly against the blue patterned floor, those well-worn boots are attached to skinny legs in black thigh-highs, a green school skirt and oversized amethyst cardigan. "Speek up? You sick? Or you're just a whiny bitch and a liar?" The blonde clicks his tongue.

 

"Wha- How long have you been there?" The greenette studders, shifting around like the coward he was. The blonde chuckles, mouth open, showing his sharp canines. It's a action the green-haired guy visibly suffers from; sweating nervously. "You- You- You shouldn't say anything either."

 

Kyousuke lifts his eyebrows in amusement. "I'm surprised you had the balls to say that loser, and in front of the teacher no less-

 

“What-

 

"So your fainting was a con job, huh?" Matsuzaki glares, coming out of the woodworks, filling the room with a eerie purple glow. 

 

Kyousuke always wondered how people do that- Like, stop, this isn't a Manga.  

 

"That's not what happened, sir! It's his fault.” Fish lips complains, pointing towards Nendo, probably crying on the teacher's shoulder like a little bitch. “He forced me to collapse so he could skip out on the principal's speech, and he forced me to say my sickness was actually a ruse!"

 

"Nendo, is that all true?!” Frowns the teacher. 

 

“Don't be a moron, it's obvious he's lying.” The blonde clicks his tongue, crossing his arms over his chest. “I don't trust you, fish-lips, your face looks punchable-

 

“Watch your language, young lady.” Matsuzaki warns. 

 

Kyousuke frowns, glancing away, catching eyes with the pink-haired teen standing quietly by the door.

 

Saiki shivers, this cold dread washes over him, sending goosebumps down his arms. A question lingers in his mind, bubbling with worry and confusion. Why wasn't this bad-mouth blonde turning into flesh and bone? How long had he been sitting behind that curtain, just hearing them argue? 

 

Just who the fuck was this bitch? 

 

This was threat-level Nendo on crack, and the way he defended Nendo- Did they know each other? This was bad, this was really, really bad. He could feel his body go numb, fingers twitching in contempt.

 

“Root sickness is a deadly virus that infects the victim through the follicles. Oh, that one.” Saiki blinks, glancing towards Matsuzaki. Did he just zone out the entire conversation? What was Matsuzaki-sensei talking about? Root sickness, well that observation was wrong.

 

“Are you having a fucking stroke?” Asks the blonde, sounding rather worried. Saiki felt the same way, being this incompetent has to be hard. “Being this incompetent has to be hard.”

 

Did he just… Did they just think the same thing? 

 

“Hey, respect your elders!" Snaps the green-haired teen. 

 

“Shut the fuck up- Y'know, I don't have to take this from the likes of you.” Spits the blonde, taking a few steps towards the bathroom connected to the infirmary, placing his hand on the doorknob. “I came here ‘cause I'm actually sick, so I'm going to continue being sick away from all this bullshit.”

 

Then he slams the door shut. 

 

The loud yapping outside the door doesn't stop, it just gets louder, more obnoxious. The screeching sound of an ambulance has him cringing, slumping his body onto the floor, bringing his knees to his chest before laying his head atop his knees. 

 

He wants to go home! 

 

Back to his tiny internet café, where the corridors are small and the unlimited melon-soda flows like water. 

 

He needs to return a game to the upfront desk, if he's late once again the older lady that runs the place will charge him double, no triple- A cold shiver runs up his spine, he can't be late, the idea of that lady glaring at him while he shyly tries to return the stupid CD makes him want to vomit.

 

No, he can't be late, not again! 

 

Jerking to his feet, Kyousuke throws the door open-

 

It's the most bizarre thing he's ever seen, maybe his blood-sugar is too low? He didn't drop acid, did he? He blinks, placing a hand over his chest, checking for a pulse, nope, he's still alive. 

 

Then it's real- 

 

The pink-haired guy is really burning the thermometer, with flames and everything.

 

“Holy shit.” The words slip out his mouth, eyes wide with shock- It registers in his mind a little too late, audibly snapping his mouth, stiffly standing by the bathroom door. 

 

For an agonizing minute, nobody moves. 

 

Then the room gets colder, darker, twisting with every breath the pink-haired guy took. The walls contort, narrowing as a dark aura fills the room with paralyzing fear. 

 

He saw. 

 

He saw. 

 

He saw.

 

Saiki could feel his erratic heartbeat in his mouth, blood rushing to his ears, frantic eyes tremble with fear- 

 

He can't move, only glare at the blonde, a stupid, idiot blonde that is just standing there, ignoring his questions, looking at him with a baffled, confused look on his stupid face. 

 

“What did you see?” He asks, taking a step forward, a step the blonde takes back- Good he's at the very least weary of him. That's good. He could work with fear, he couldn't work with that dumb, blank look the blonde was giving him. “Answer.”  

 

Fuck it.

 

Saiki teleports closer, body tensed, placing a heavy hand on the blonde's chest. 

 

The sea-green fabric of their uniform squeaks sharply underneath Kusuo's fingers, it glides smoothly against his fingertips, clumping around his rough grip. Kusuo avoids his skin, the idea of touching this shameless stranger is nauseating. It doesn't stop him from pinning him against the wall, glaring up at the physically taller teen.

 

“Tell anyone and I'll kill you.” Saiki spits. 

 

The blonde just stares. 

 

“Are you even listening?” He tries again.

 

“Um… So, are we gonna kiss?” Kyousuke flashes his best eat-shit grin, blinking his long pale eyelashes, hoping his overnight cat-shaped eyeliner isn't too smudged, hoping he still looks pretty; pretty enough to get him out of this terrifying situation. It doesn't seem to be enough, his almond-shaped eyes travel to the hand roughly holding him in place, smiling through his dangerously high heartbeat.

 

Saiki frowns, at the mocking glimmer in the blonde's sapphire eyes. 

 

He's having too much fun. 

 

Saiki could snap his head like a fucking twig, he didn't get that? He didn't understand the gravity of his situation- Maybe he was as stupid as Nendo- No, his eyes seemed bright, intelligent, confused maybe? Did he not speak Japanese- 

 

He can't understand, period, Saiki mused, rolling his eyes. 

 

With a twitch of his eyes, Saiki opens his mouth, speaking without using his telepathy. “Tell anyone what you saw and I will kill you. Do you understand now? Do you need an example?” 

 

“Nope.” The blonde opens his mouth, his hair caresses his face, like a gold adornment. He smacks his lips as the scent of vanilla-bean slaps him across the face. 

 

Why the hell was this random pink-haired guy so pretty? 

 

He had bored, cruel eyes, hidden underneath ugly green glasses, an unyielding grip, strong and sturdy. It contrasts with his girly Magenta hair and those dumb round antennas, such a cute accessory. 

 

It doesn't help that he smells good enough to eat- 

 

One bite. 

 

His hair is made of cotton candy, It'll be fluffy and sweet. 

 

Saiki teleports across the room, bumping into the wall as he scrambles away. Did he just try to remove his antennas? Did he know? Was this his brother's doing? Just what the hell was going on? Why couldn't he read this random guy's thoughts?

 

Why did none of his powers work on this guy?  

 

“I don't know what you're talking about, buddy.” It's a handful of apprehensive words, spoken stiffly, like he finally understood the threatening atmosphere. Then his uneasy eyes shift ever so slightly towards the open door. “Matsuzaki-sensei.” 

 

Matsuzaki-sensei? 

 

No, that should be impossible, he didn't hear the older man's thoughts, he knows it's fake, it has to be, but after everything Saiki Kusuo is nothing but a curious human. 

 

Saiki snaps his head towards the door, in slow motion, eyes wide, but-

 

Matsuzaki isn't at the door-

 

That little bitch lied to him, and he totally fell for it like a idiot!! 

 

Kusuo jerks his head towards the blonde, he's gone- 

 

He's by the window, holding onto the windowpane, bag over his shoulder. Saiki blinks. The blonde chuckles awkwardly, jumping down from the second story window onto the front courtyard.  

 

Snapping his mouth shut, Kusuo teleports closer to the window, watching as the blonde curses in pain. He should go after him, but then the bell chimes softly, students start to flood the courtyard, chatting amongst themselves as they walk home. 

 

The blonde is lost in a sea of colorful hair, blending in perfectly, leaving Saiki with an odd taste in his mouth, still gripping the thermometer. 

 

What the fuck just happened!!?



×



Kyousuke dramatically paws at his chest, sighing deeply as he flees the horror school. 

 

That guy was totally going to kill him!! 

 

Ugh, what the hell!! That look in his eyes was totally scary, it sent a shiver up his spine, his body feels icy even with the sun kissing his skin. 

 

He's never coming back to this place, never, ever!!  

 

His shitty, pink bicycle is exactly where he left it, hidden behind an alleyway, discarded like trash against a wall. Thank god nobody took it, he didn't have the money for the long train-ride back to Kabuki-cho. 

 

With an exhausted sigh, Kyousuke gets on his bicycle, fixing the backpack upon his shoulder, shooting the gods a small prayer; “Please don't ever let me return to this horrible place.”   before heading his way.