From Oblivion Lumiere:
Soujirou possesses a special predisposition that causes him to "transform into another gender when his heart throbs." Moreover, her girlfriend, Ichijou Sakura, is an elite young lady who came to acquire the same special predisposition as well. Their love life is filled with chaotically transforming between male and female; is this normal romance or girl's love or boy's love or other!? This is a love comedy featuring transformation between male and female★