Kouonosuke come from a rabbit ancestors family which run a shrine. He is very helpful person and cant resist people in need. His childhood friend shu is a popular in school. K do him a bento and sew things and hand over a love letters. Shu is in love in K but dont say it he like to be spoiled by him. Once shu was suronded by girl and it made K jealous. He realized his feelings and his ears and tail pop up. He was confused. The next day when he went to consulte with shu who focus on his love interest before his problem he change into rabbit. He come back to being person after kiss.
Aitai Jou to Usagi no Yamai