Natsume's Book of Friends manga volume 25 features story and art by Yuki Midorikawa.

Nyanko Sensei is missing, and the only clue to his whereabouts is a shard of pottery painted with calico markings! Following the urgings of a dream sent by the shard, Natsume travels to a local kiln and finds that there's far more going on than just a lost kitty yokai.