Welcome to Crimson Strings, a Haikyuu Yandere University AU story drenched in desire, obsession, and dangerous love. This isn't your average fluff-filled romance. This is where fantasy meets darkness, where love is sharp like a knife and the heart isn't the only thing that bleeds.
Inspired by the chilling beauty of yandere tropes, this fanfic blends psychological horror with romance and polyamory. If you're a fan of morally grey characters, twisted affections, and high-stakes emotion you're in the right place.
This is your story. But don't expect to come out unscathed.
Please Heed the Warnings. Your safety and comfort come first.
With all the bloody love,
-Zikori
Character Introduction
Y/n L/n (You)
A transfer student with a mysterious past. You're quiet, observant, and stronger than you appear. You've learned to survive, now you'll have to learn how to escape.
Yuji Terushima
Flirtatious and controlling. He calls you "babe" with a grin and a threat beneath it.
Kuroo Tetsurō
Strategic, smooth-talking, and dangerous. His affection is obsessive, his manipulation a form of art.
Bokuto Kōtarō
Explosive and loyal. His love is intense, his rage even more so.
Oikawa Tōru
The golden boy with a god complex. He thinks you're his reward, and he'll destroy anyone who disagrees.
Semi Eita
Soft-spoken, musical, and deeply unhinged. He composes sonatas about your smile and symphonies about your death.
Atsumu Miya
Charming and chaotic. He's fun until he snaps and when he does, no one's laughing.
Osamu Miya
Calmer than Atsumu, but twice as cruel when it comes to sharing. And he will share you, just not with the outside world.
Tsukishima Kei
Cold, calculating, and silently obsessed. He watches everything. Especially you.
Suna Rintarō
A ghost with a camera and a diary full of your secrets. He's always near. Even when you think you're alone.
Prologue: Crimson Strings
They say Aokigahara Academy is the future of Japan's elite.
They don't mention the whispers behind the ivy-covered walls. The missing girls. The bloody footprints on pristine floors. The rumors that once you catch their eye, it's already too late.
When you stepped through the school gates, your only goal was to finish the year quietly. No drama. No distractions.
But then you saw them.
And worse they saw you.
Nine boys. Each beautiful. Each terrifying in their own way. They didn't smile at you.
They claimed you.
You just didn't know it yet.
But you will.
And when you do... you'll wish you had never looked back.
> Read at your own risk. This story contains disturbing content that may not be suitable for all readers. Viewer discretion is strongly advised.