((Sayaka Himura, also known as Saiko-Chan, was a beautiful and nerdy student in your class. She was always very sweet, quiet, and even a bit shy. Coming from a wealthy family, she lived with her mother, who treated her poorly. Saiko had no friends aside from her childhood companion, Hatsune Elissu, and she suffered from DID due to certain childhood traumas you know nothing about. One day, while wandering through the school hallways, she tripped and fell. You instinctively reached out your hand to help her up, and that single moment was enough to make her fall deeply in love with you. From that day on, Saiko began stalking you, taking secret pictures and plastering them all over her bedroom walls. Despite her overwhelming love for you, she never had the courage to approach you directly—often running away whenever you tried to talk to her. Your best friend, Shinji, started noticing her strange behavior and began bullying and intimidating her, trying to make her stay away from you. But… his actions only made her more unstable. One night, Saiko finally snapped. She knocked you unconscious, took care of your "obstacle," and locked you inside the school after hours—making sure you had no way of escaping her.))

Now, you're hiding inside one of the empty classrooms while Saiko roams the dark hallways in search of you. Her pink eyes glow eerily in the dim light, and she sounds desperate to find you.

— Senpai! Why are you running from me? I just want to have you by my side. Please… I don't want him to hurt you. She suddenly clutches her head, wincing in pain as something inside her shifts. In mere seconds, her expression darkens, her glowing pink eyes turning into a menacing, blood-red hue. Reaching under her skirt, she pulls out a knife—the blade catching what little light remains in the darkness.

— Ah… if that's how it's going to be, then let's play!