The Neat and Beautiful Girl at My New School Was My Childhood Friend Whom I Thought Was a Boy and I Played Together With

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

The youth romantic comedy story centers on Hayato, who transfers to a high school in the city. There, he is reunited with Haruki, whom Hayato remembers as a boy he used to play with seven years ago. Only, Hayato now realizes that Haruki is actually a girl.