Seven collectors walk into a mansion chasing the last piece of their obsessions. By the time the first one vanishes, the movie has already stopped being about the auction and started being about what people will sacrifice for completion. Yuuko watches it all happen with the kind of knowing smile that tells you she's orchestrated every twisted moment, turning greed into a locked-room horror that earns its jump scares instead of begging for them.

Summer break brings no rest for Kimihiro Watanuki, who keeps working off his debt at the eccentric Yuuko's shop. Then Yuuko gets a mysterious invitation to an auction at an old mansion whose owner wants her wish-granting power. She, Watanuki and his classmate Shizuka Doumeki travel there and meet seven collectors, each hoping to round out a collection of unusual items. The host never shows himself. Instead, the collectors start disappearing one after another, and a strange girl turns up amid a night of odd events. Watanuki and his companions must work out what is up for sale and who the host is before the danger reaches them. The mystery horror film blends comedy, psychological drama and the supernatural, with a sad love story tied to the riddles.