Onnanoko Tokidoki Otokonoko
女の子ときどき男のこ
Yuusuke and Akira were childhood friends until Akira's father was transferred for work, separating them for a decade. Akira has now returned and moved in next door, appearing as a girl and seeking to have Yuusuke fulfill a childhood promise. However, the situation is complicated by the fact that Akira is actually male. An additional chapter is included.