Nonoko-san no Kanojo-kun ♂

Synopsis

One day, Kennosuke Maki, the smart and handsome prince of the school, inadvertently confesses his love to his crush, Nonoko. She says yes, but in the wrong place at the wrong time, because Maki is cross-dressing as a woman for the school festival! Feeling unable to reveal his true identity for fear of scaring her away, Maki begins dating as as a girl "Makiko". But actually, Nonoko realized all along that it is really Maki in the girls clothing, and she has a misunderstanding...? (Source: Shonen Sirius, translated)