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Yūko Katori is Shō and Shigeki's English teacher and was also the soccer club's coach before Matsushita. She is a bit of an airhead but is very concerned for her students. After seeing that Shō wanted to be one of the best soccer varsity players, she tries her best to support him and his comrades by assisting in their retreat, despite not knowing much about soccer. Kō once tried to make advances on her, which may or may have not worked. Shigeki calls her Ane-san (Big Sister).