In a stark white room, Takato Keisuke and six others awaken with no memory of how they got there. The group includes his childhood friend Hokari Kanae, classmate Ando Miyako, underclassmate Mikaba Rika, English teacher Aoi Natsuki, peer Byakuya Rinne, and classmate Manaka Nemu. As confusion sets in, a mysterious voice announces the start of a twisted game. To escape, Keisuke, the "unlocker," must perform specific acts with a chosen heroine, the "keyhole."

The unsettling requirements provoke outrage in Miyako, who rebels against the voice. Her defiance leads to her being strapped to a horrific device as a gruesome example. The voice warns that quitting the game results in death. Amidst the chaos and terror, Keisuke's dark desires begin to surface, aroused by Miyako's plight. Nemu, noticing his reaction, exploits his weakness and manipulates him with a coercive kiss, sealing a manipulative contract.

Determined to protect Kanae and driven by his own urges, Keisuke resolves to violate the others to survive. As the tension mounts, will he manage to escape the sinister rooms and reclaim his normal life, or will his dark side consume him entirely?

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