Oh Boy, Was I Wrong About Her

転校先の清楚可憐な美少女が、昔男子と思って一緒に遊んだ幼馴染だった件1 Season

Seven years after making a childhood promise to always be friends, Hayato is reunited with his formerly tomboyish pal Haruki at a city high school–only now, Haruki has transformed into the girl every guy dreams about!