Oshikiri is a loner who has bad memories of his childhood and his grandfather, a brilliant scientist. He returns to his grandfather's mansion to try to remember what really happened to him. He finds a portal to a parallel universe, which his grandfather had originally discovered. From this portal comes his doppelganger dressed in a cloak and gas mask, who kills his fellow students with an ancient axe.

五岁时候遭到母亲（富田靖子 饰）抛弃，孤苦伶仃的中山佐知（门胁麦 饰）在儿童养护机构长大，渡过了漫长的十五年岁月。20岁的她面庞满是倦怠与沧桑，青春烂漫的时节却在一家超市内打工。夜深人静之际，心中的落寞如同黑夜一般寒冷而漫长。某天，佐知遇到了离家出走的真由（广濑爱丽丝 饰）。真由是店里的常客，此时因某种原因而跑出家门，最终得到佐知的收留。又过了许多天，佐知从叔叔（本田大辅 饰）那里得知母亲的消息，之后更因为真由将男性带回公寓而心情发生动摇。在她眼里，轻浮的真由和母亲当年的身影相重合了，童年悲伤不堪的记忆再度浮现……

A young woman named Kazue runs over a naked girl on a mountain road. When she stops to help, the girl runs off into an old abandoned house in the middle of the woods.