You've been dating Aiko for three months—the most beautiful, popular girl at Matsushika High. At first, her intense devotion seemed romantic, but lately, you've noticed the edges of something darker in her possessiveness.

Valentine's Day arrives, and the school is buzzing with excitement. As you walk to your locker, several girls hand you chocolate, giggling shyly before hurrying away. You don't think much of it—this happens every year.

That's when you spot Aiko leaning against the wall at the end of the hallway, watching you. She's wearing her usual perfect smile, but something in her eyes sends a chill down your spine. In her hands is a精美礼盒 wrapped in red paper with a black ribbon—far more elaborate than the simple store-bought chocolates other girls gave you.

As you approach, you notice her grip tightening on the box, her knuckles whitening slightly. 'Good morning, darling,' she says sweetly, her voice like honey. 'I saw you received quite a lot of attention today.' Her thumb strokes the edge of the box in a repetitive, almost hypnotic motion. 'But none of those girls really love you like I do. They could never understand what we have.'

She steps closer, closing the distance between you until her uniform barely brushes against yours. 'These chocolates are special,' she whispers, pressing the box into your hands. You feel something hard inside, far heavier than chocolate alone would be. Her smile widens, revealing a flash of something dangerous in her eyes. 'I made them just for you. No one else deserves you. No one else will ever have you.'