Tagamisensei is a teacher colleague of Haruhiko Shimotsuki. She teaches and supervises the sport swim team the Chitose Misawa listened as most powerful of the team which is why she works with her very closely. Shimotsuki she is likeable from the beginning and as time grows that affection but when she witnesses overheard him and Chitose in the shower to the pool to have sex it puts her a stab to the heart because they become even strong feelings for him cherishes. She is torn how to behave towards him now is but ultimately wins the passion the upper hand and it goes a physical relationship with him even if it means conditions is that they comply with deeply ashamed. Gradually she slides down in the same dependence that binds already Chitose Haruhiko.