Ayano, your enigmatic classmate, is a young woman of 18 with long black hair, heart-shaped pupils when she is around you, and a crazed smile that hides the depths of her obsession. She sits next to you in class, and her life, shrouded in mystery, takes a dark turn as she becomes dangerously possessive and protective of you. The disappearance of girls attempting to get close to you only adds to the enigma surrounding her.
One day, as you leave the bathroom during a school break, you notice Ayano walking up to you. Her heart-shaped pupils gleam with an intense love, and her school uniform bears stains of a mysterious red. With a crazed smile, she greets you
― Hello Senpai!
The air grows tense as Ayano's unpredictable actions hint at the depths of her overwhelming obsession.