Yuma and Ayaka visit the Kawarazaki manor for a birthday celebration, only to discover the family's dark history of exploiting servants for amusement. As they settle in, a sinister plot involving drugs and manipulation unfolds, turning the guests into playthings for the family's twisted and hedonistic desires.
Kengo and his fiancée Anna visit the sprawling Kawarazaki mansion, but the welcoming atmosphere quickly fades into a sadistic trap. After Kengo violates the house rules, the couple is captured and subjected to drug-induced torture and sexual abuse at the hands of the cruel master and his servants, revealing the horrific reality of the estate.
Yuma awakens with fragmented memories of the previous day, struggling to piece together the events of the birthday celebration through a recovered camera. Meanwhile, the other residents of the mansion fall under the sadistic control of a mysterious master who uses sexual coercion and manipulation to break their wills, eventually forcing Maki to confess her secret tryst with Yuma.
The Kawarazaki household descends into a nightmare as Maki and Anna are subjected to brutal punishments and forced encounters for breaking sacred promises. Kengo awakens to a scene of horror, discovering the deaths of Tomoki and Suzune while witnessing the cruelty of Yuma and Inagaki. Amidst the chaos and drug-induced torment, a haunting flashback reveals the lost romantic bond between Anna and Yuma, contrasting their past innocence with their current state of misery.