Shuji’s first lover and Tetsu’s wife. She used to train the track team when she was younger and her students called her “Fuyumi-senpai” because of the close age difference. She had an intimate and inappropriate relationship with Shuji when they were younger--the manga shows her giving him detailed instructions for pleasuring her--and keeps bringing this up when she seduces him. She hates feeling lonely since her husband, Tetsu, is never home since he’s always away in the army so she decides to take comfort in Shuji, who has a remarkable similarity with Tetsu. Shuji finally stops her advances after Tetsu dies, saying that the only person he wants to protect isn’t Fuyumi. She admits she has always used him to fill her own physical and emotional needs, slaps him, and rides her bike to her parents’ house, never to be seen again. In the manga version, she is seen in her parents' house, helping her sick father and reminiscing about Tetsu the night before Chise destroys the city.