Kasumi Kishimoto  

, 岸本 かすみ

The protagonist attends myōjō high school and resides with her aunt chigusa, who runs a boarding house for four male students from the same school without kasumi's knowledge. when yusaku discovers kasumi taking a bath, she becomes conflicted because she is still loyal to katsuhiko, her boyfriend. the development of kasumi's feelings toward yusaku forms the main narrative arc in the series.