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Rikujoubu no Bokukko Doukyuusei ga Chuunen Komon ni Mesu ni Sareru Ichibu Shijuu
陸上部のボクっ娘同級生が中年顧問にメスにされる一部始終
Toshimitsu Fukuyama and Yuki Hojo are second-year students and members of the same track and field club. They call each other "Toshi" and "Yuki" and are rivals in sprint races, competing for first place. However, both are aware of each other as a man and a woman, wanting to move beyond their relationship as ordinary friends.
Yuki is confused by the sudden onset of secondary sexual characteristics during puberty, which makes her body less suited for sprinting. Her performance declines, and Toshi begins to see her as a woman, straining their relationship until they eventually fall out. At that time, Yuki receives athletic advice and support from her coach, who has feelings for her that go beyond that of a teacher. But dark rumors surround the coach.
