The story revolves around Yatsuse Hiiragi, a first-year high school student who cannot refuse requests because he wants to get along well with the people around him and not be disliked by them. However, nothing he does goes well and he has no one he can call a best friend. One summer day when it snows out of season, he meets Tsumugi, a demon girl who has come to the human world looking for her mother.