A girl who appears in episode 1 for the first time. Kureha's classmate, a member and one of the leaders of the Invisible Storm. Katyusha is seen putting down with bear warning signs during an alarm in the first episode. She also outed Sumika for refusing to exclude Kureha. She was later eaten by Ginko and Lulu, with her iconic headband preserved, and is used to lure Eriko to the flowerbed for eating.