Hina Setoguchi

Yuu's younger sister and a member of the track and field club. Childhood friends with Natsuki's brother, Koutarou, who has feelings for her. Likes Koyuki. Ima Suki ni Naru and Senpai. are about her feelings for Koyuki and Ima Suki ni Naru -triangle story- and Sankaku Jealousy are Koutarou's reactions. Terekakushi Shishunki focuses on her relationship with her older brother. Daikirai na wa Zudatta. shows her relationship with Koutarou in their second year of high school.