Natsume's Book of Friends manga volume 30 features story and art by Yuki Midorikawa.

Natsume receives a secondhand invitation to a gathering of antiques dealers and afficionados. The event, however, is no mundane auction, and the guest list is filled with friends and foes alike. When the whole building is locked down after a theft is discovered, Natsume must rally his allies before his enemies make their move!