『Mitsuki Sonoda』

Yū's older sister and the school's student council president. She is suspicious of the relationship between Haruka and Yū and often concocts plans with Kaede and Yuzu to catch them in the act. Like her sister Yū, she is also very fond of green tea mochi flavored foods. She develops a crush on Haruka and tends to have frequent delusions about them being intimate.