S1, E3: After learning that Ms. Chiko had been infected poisonous smoke from a demon known as Dokuro, designed to make her ripe enough to eat in three days, Enma engages her in battle but is forced to retreat before he can remove the poison. With the third day approaching, the Yokai patrol decide to have Yukiko take Ms. Chiko's place. After Yukiko and Harumi carefully obtain Ms. Chiko's underwear to wear in order to complete her disguise, Dokoro appears and is quickly finished by Enma.