Onnanoko Tokidoki OtokonokoGirl (Sometimes) Boy; 女の子ときどき男のこ; Girl [Heartbeat] Boy; オンナノコときどきオトコノコ

Yuusuke's childhood friend Akira is back as a beautiful girl, but something is not right. Despite the fact that Yuusuke doesn't remember much of Akira, he definitely knows Akira is a male.