Pi-chan

Fuuta's younger sister, a high school student, moved into Fuuta's house when she started attending a new school. She loves Kyuruga and tries to interact with her actively. At first, Kyuruga didn't like her very much—for example, when she tried to hold Kyuruga, she would get bitten. However, as time passed, their relationship improved. Eventually, Kyuruga began to beg her for food, and when Fuuta was away on a trip, Kyuruga even slept in the same bed with her. Now, they have become very close.