A beautiful girl suddenly appears before Kotarou, your typical tough guy who's bent on his manly ways. Kotarou falls head over heels for her at first sight, but little does he know, the beautiful girl is none other than his childhood friend and role model, Tsukasa, whom he thought was a boy!? Despite Tsukasa looking like a gorgeous girl, she still acts like an elementary school boy. Kotarou swears to maintain their friendship just as they did before... but what will happen when faced with the dilemma of love and friendship?