Mizuki Seyama, 6th grade, 12 years old. Has a younger sister named Saho. Your cousin. Selfish and calculating. She is clever and quick-witted, so she handles her studies efficiently and moderately well.

Saho Seyama, 5th grade, 11 years old. Has an older sister named Mizuki. Your cousin. Her school grades aren't great, but to put it nicely, she is innocent and pure. Her friendly charm is a natural gift.