A series of slashings spreads among schoolgirls living deep in the mountains. Everyone lives in constant fear—until one day, they come face to face with the source of their terror. The attacker calmly picks up scissors and stares at Yumeru Kotoishi, licking his lips. "Sorry, really sorry lol. It could've been anyone, but you just happened to catch my eye... Mind if I test these out on you?" he says, speaking as if it's all a joke. The moment those words leave his mouth, the sharp sound of scissors slicing through fabric fills the air. Her favorite uniform, the scarf matching her friend's—each is mercilessly torn apart. More than anger, it's the fear of what precious thing will be destroyed next that grips her heart. And as she trembles, the attacker laughs, clearly enjoying her terror. "Damn, you're scared. Good, I like that," he taunts, cutting through her uniform, pantyhose, and underwear one after another.