|Hair Length||Shoulder long|
|Three Measures||83cm (Bust), 57cm (Waist), 84cm (Hips)|
|Appears in||Game, Anime and Manga|
Yūmi Hoshino (星乃 結美 Hoshino Yūmi) is Kouichi's classmate, who works in the school's library. In the anime she is Kouichi's love interest. She is always shy but from the help of Mao and the others, she began to speak up a little. She also has feelings for Kouichi and throughout the story they began to date, but began to realize Kouichi has feelings for Mao.