 Yuko receives an invitation for the opening of an auction from a mysterious unknown sender. Likewise, fanatical collectors are summoned to an old mansion whose owner doesn t make an appearance. One after another, each collector disappears and a number of other strange occurrences happen during the night. The questions of what exactly it is that s being auctioned and who the owner of the mansion is must be solved in order for Yuko and Watanuki to get to the bottom of this.