Satori's homeroom teacher. Yoshikawa joins Muroe's kendo club because she is worried about Satori's well-being. Once Satori proves she can manage both kendo and her studies, Yoshikawa keeps backing the club. She and Kojirou grow friendly and often talk when they are together in the staff room. She is good at playing video games. After Kojirou quits the kendo club, the members ask Yoshikawa to serve as their advisor; she accepts the role until she takes maternity leave. The father of her child is Kenzaburou, who is Kojirou's senior.
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