Takato Keisuke and six others wake up in a mysterious white room with no memory of how they got there. Alongside him are his childhood friend Hokari Kanae, classmate Ando Miyako, underclassmate Mikaba Rika, English teacher Aoi Natsuki, same year Byakuya Rinne, and classmate Manaka Nemu. Confused and frightened, they hear a mysterious voice announce the start of a twisted game: Keisuke is the "unlocker" and one of the girls is the "keyhole." To escape, Keisuke must perform specific acts with each girl.

As the disturbing rules are revealed, Miyako lashes out in anger, only to be bound to a grotesque device as punishment. Her screams fill the room as she is subjected to an electric shock, causing the others to panic. Amidst the chaos, Keisuke's dark desires are awakened, much to the shock of Nemu, who sees through his facade. She manipulates him, sealing their pact with a kiss and compelling him to violate the others in their quest for freedom.

Keisuke is torn between his urge to protect Kanae and the immoral acts he must commit to survive. Will he escape the white rooms and return to his normal life, or succumb to his darkest urges?

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