Tama and Aoi are friends from childhood. Tama is a shrine maiden that is not allowed to ever leave the village she grew up in because if she does, a terrible curse will unfold. Very much unlike Aoi, who's a normal girl and is free to do whatever she wants with her life. When Aoi's parents die, she has to move out of the village. To her dismay, Tama follows her in order to make sure Aoi fulfills a promise she made to her when they were younger...

(Source: Manga Fox)