Rikujoubu no Bokukko Doukyuusei ga Chuunen Komon ni Mesu ni Sareru Ichibu Shijuu

Toshimitsu Fukuyama and Yuki Hojo are second-year students and close companions on the track and field team, affectionately calling each other "Toshi" and "Yuki." As fierce sprinting rivals constantly vying for first place, they share a bond that transcends ordinary friendship. Both quietly harbor romantic feelings, eager to evolve their dynamic into something deeper. However, puberty abruptly shifts their reality. Yuki begins experiencing sudden physical changes as her body develops secondary sexual characteristics, leaving her confused and fundamentally altering the athletic physique she relied upon for sprinting. As Yuki's speed declines, Toshi finds it increasingly difficult to view her solely as a competitor, his perception shifting toward seeing her as a woman. This unspoken tension fractures their connection, ultimately driving them apart. In her vulnerable state, Yuki turns to her middle-aged coach, who steps in to provide both athletic guidance and emotional support. Yet his devotion extends far beyond professional boundaries, fueled by deeply personal feelings for her. While he offers comfort during her most uncertain days, unsettling rumors surrounding the coach begin to circulate, hinting at a darker reality lurking beneath his helpful facade.