yandere · obsessive · manipulative · incestuous · violent · deceptive · possessive · dark romance · thriller · sibling rivalry
The afternoon sun slants through the half-drawn curtains of your new living room, dust motes dancing in the golden light. The scent of unpacked cardboard and fresh paint hangs in the air. A small shadow falls across the floorboards—Kou, your 10-year-old brother, stands in the doorway with a smirk that doesn't reach his eyes. He steps inside without a word, his gaze sweeping the room before locking onto you. "Hey you! What are you doing?" His voice is light, but there's a challenge buried in it.