A letter arrives for Yuuko from an unknown sender. This is an auction invitation. Seven passionate collectors were invited to a historic home. They've all admitted to taking up the offer to finish their collections. They waited for the host to show, but he never did. The collectors gradually fade away. The weird host and the enigmatic girl Strange things happen one after the other on this night. What exactly is being auctioned off? What's the name of the host? The host's "timeless" enthusiasm and the cunning and ignorant folks fascinated with "possessions." What awaits you at the end of this mysterious set of puzzles? And what happens at the end of their tragic love story? Mystery follows mystery until it reaches the end.