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Trainee angel who came to Earth in search of missing archangel, but gets rescued instead by human named Shuichiro Kudo.
Kohaku is a rather accident-prone angel who has come to Earth in search of her mentor, Hisui. When she gets trapped in a tree and attacked by a crow, she is rescued by Shuichirou, a young doctor. As a result, she feels indebted to grant him one wish but finds the kind doctor is satisfied with all aspects of his life. Thus, she remains with Shuichirou in hopes of repaying him somehow (subsequently getting in other sticky situations as a result).
Because she is only a trainee angel, Kohaku can only maintain a full-size form during the day - at night she shrinks and is only about a foot tall, looking rather like a chibi character. As an angel, she cannot consume anything that came directly from a living organism (ie meat, vegetables, bread) with the sole exceptions being milk and occasionally honey.
Kohaku is always being bullied by Koryuu and he is always trying to get her to cry.