Tsukikage Moratorium

The romantic comedy story centers on Saku Tsukimiya, a male high school student who is as beautiful as a girl. On the night of his 17th birthday he has a dream wherein a mysterious voice refers to him a princess. When he wakes, a mysterious being tells him that he is the reincarnation of Princess Kaguya, and his body has undergone a transformation.

(Source: Akita Shoten, translated)