Kohaku

Kohaku is a rather accident-prone angel who has come to Earth in search of their mentor, Hisui. Then they gets trapped in a tree and attacked by a crow, they are rescued by Shuichirou, a young doctor. As a result, they feel indebted to grant him one wish but finds the kind doctor is satisfied with all aspects of his life. Thus, they remain with Shuichirou in hopes of repaying him somehow (subsequently getting in other sticky situations as a result). Because they are only a trainee angel, Kohaku can only maintain a full-size form during the day - at night they shrink and become only about a foot tall, looking like a chibi character. As an angel, they cannot consume anything that came directly from a living organism (i.e. meat, vegetables, bread) with the sole exception being milk and occasionally honey.