In Euphoria Episode 04, Takato Keisuke and six others find themselves in a mysterious white room with no recollection of how they arrived. Alongside his childhood friend Hokari Kanae, classmate Ando Miyako, underclassmate Mikaba Rika, English teacher Aoi Natsuki, fellow student Byakuya Rinne, and classmate Manaka Nemu, Keisuke is thrust into a twisted game orchestrated by a sinister voice. To escape, Keisuke, the "unlocker," must perform specific acts with one of the girls, designated as the "keyhole."

As the rules are unveiled, Miyako rebels against the voice, leading to a horrifying punishment that leaves everyone in terror. Keisuke's hidden desires surface, catching the attention of Nemu, who manipulates him into compliance with a provocative "contract kiss." Determined to protect Kanae, Keisuke resolves to engage in the depraved acts demanded by the game.

Will Keisuke overcome his dark impulses and find a way out, or will the sinister game consume them all? Experience the intense psychological and physical trials faced by the characters in this gripping episode.

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