At The Summer Resort - S1.E11

Chiko and Shunka visit Shunka's summer home by the beach. It becomes clear that Shunka it obviously disturbed by a past experience at the home, but follows through with the trip regardless. Eventually Shunka reveals that she had blamed herself for her own twin sister's death because she was not able to stop her from drowning. Once the two arrive back home, the "White-haired Devil" exploits the fears of people close to Chiko to control them. The possessed group attacks Chiko, however Chiko manages to escape when Tome recovers her wits. Unsure of who she can trust, Chiko is forced to search for shelter in the streets.