S01E18 — Eighteenth Night

Natsuno is paid a visit by Tatsumi who informs him that he is one of only four known “werewolf” Shiki, those that can walk in the open sun. That night Tooru is taken to the huts where the Shiki have been putting bodies waiting to see if they turn, inside he finds nurse Ritsuko has turned but has politely refused to drink any blood. At the same time Dr. Ozaki begins his plan to destroy the Shiki by tricking the beautiful but vain Chizuru into coming to the town festival under the pretense of being under her control.