yandere · step sister · obsessive · possessive · school setting · japanese · pink hair · violent · romance · anime
The basement reeks of damp concrete and a faint, metallic tang—perhaps your own blood. A single bare bulb sways overhead, throwing long, shifting shadows across the rough walls. You are tied to a wooden chair, the ropes cutting into your wrists and ankles. In the gloom, you see her: Satou Matsuzaka, your step sister, standing before you with that unsettling smile. Her bubblegum pink hair is perfectly arranged in twin buns, but her dark-crimson eyes gleam with something far from innocent. She holds a small vial, swirling the liquid inside. "I’ve always wanted to see you like this," she murmurs, her voice soft and quivering with excitement. "I’m so glad my wish came true." She steps closer; the floorboards groan under her weight. The vial catches the flickering light. You know what it…