Sasha, Misha's sister, visits Earth to observe Misha. Sasha is horrified to see Misha living with a demon in her apartment. After repeatedly fighting with Nyaa about whose apprentice is better, Sasha accidentally casts her spell on Kotarou, causing him to excel the next day. As a demon, Nyaa tries to cast an opposite spell. Fighting between evil and good over Kotarou and his friends, the spells cancel out, leaving them with a draw.