The fire alarm wouldn't stop screaming.
Kenji stumbled down the now blood-smeared hallway, the metallic stench of gore clinging to his clothes. The once-pristine floors of East Kyosei High were a mess of upturned desks, glass shards, and streaks of red. From the science block to the gym, chaos had erupted like hell cracked open under their feet.
Behind him? Moaning. Growling. Footsteps that didn't sound human anymore.
He glanced at his trembling hands. "Am I shaking… or is that just adrenaline?"
"No. You're awakening."
Kenji jerked to a stop, eyes widening. "Who the hell—?!"
"Relax, meat puppet. I'm your system. Just installed myself inside your brain. Kinda cozy in here. Bit hormonal, though."
The voice was sultry, feminine—like a late-night call girl dipped in code and mischief. It echoed smoothly in his head, teasing like she was licking every word.
"You may call me... Sin. Short for Strategic Intimacy Network. I'm here to help you level up, stay alive, and maybe... get lucky."
Kenji blinked. "The hell is this? I'm hallucinating. This is a dream. I'm—"
"Nope. This is the MILF Apocalypse, sugar. The world's gone tits-up. Literally."
He ducked into a classroom just as a zombified track star crashed into the wall beside him. The boy's jaw was unhinged, eyes glazed, muscles spasming. Kenji slammed the door shut and locked it with a desk. Heavy breathing. Blood pounding in his ears. Then—
[Ding!]
Sin System Activated.
New Host: Kenji Rokkaku (Age 18)
Class: Survivor Lv. 1
Traits Unlocked:
[Adrenal Rush] – Speed x2 when fleeing death.
[Lucky Pervert] – +30% chance of accidental erotic encounters.
[MILF Radar] – Can detect mature women with high compatibility.
Kenji stared at the floating text in front of his eyes, swiping his hand through it.
"Okay… okay this is insane. Like, anime-tier insane."
"Mmm. And I'm just getting started," Sin purred. "Want to survive this hellhole? You're gonna need to fight, flirt, and f**k your way through it. You're special, Kenji. Your arousal… fuels evolution."
He choked. "My what?!"
"Your libido. Your lust. It's your power source. High pleasure equals high XP. Save women, seduce women, protect them, even just fantasize hard enough—you'll grow stronger."
He was speechless. Then, from the hallway, a scream pierced the air—sharp, feminine, desperate.
Kenji turned to the door. His body moved before his brain caught up.
Rei Kanzaki, the voluptuous biology teacher with raven-black hair and a lab coat clinging to curves that textbooks had no business seeing, was cornered in the biology lab. Two zombified seniors clawed at broken shelves, inching toward her. Her heel was snapped, her thigh-slit skirt torn just above the knee. Her chest rose and fell, heavy from panic and exhaustion.
Kenji burst in like a madman with a fire extinguisher, smashing one of the zombies across the face. The second lunged—Kenji ducked, rolled under a table, grabbed a scalpel from a nearby tray, and drove it into the bastard's neck. He panted hard, staring down at the now-limp corpses.
Rei Kanzaki blinked, chest heaving. "Kenji...? Rokkaku-kun?"
He looked up. Blood smeared on his face. Eyes burning. She was trembling. Vulnerable. Alive.
He reached out his hand. "Come with me if you wanna live."
She looked at him like he was a stranger—then a savior.
[Ding!]
Bond Level Initiated: Rei Kanzaki (MILF Class – S Tier)
Reward: +10 XP
Passive Unlocked: [Boob Cushion] – 5% faster recovery when resting against Rei's chest.
"Told you," Sin purred. "Your survival... is soft and stacked."
Rei gripped Kenji's arm as they ran. "I don't know what's happening—those students—they turned. Started biting. It's like a virus—"
Kenji grunted. "Yeah. I don't know what it is either, but it's spreading fast. We gotta find the others and get out."
"And maybe… peek up her skirt when she stumbles," Sin added. "Lucky Pervert activates in 3... 2... 1…"
Rei tripped—right into Kenji's arms. Her bust pressed against his chest. Her thighs straddled his knee as they collapsed. Face to cleavage. Warm, soft, heavy. He froze.
She gasped, face red. "K-Kenji…!"
[Passive Triggered: Boob Cushion]
+5 HP. +Mental Calmness.
"Healing successful," Sin hummed. "Would you like to motorboat for bonus XP?"