The Sisters' Story is a trilogy made by masa, it tells the story of the twin sisters Tsukuyomi and Amaterasu, who despite their diffrences, love each other so much they can't stand being apart. In a previous life, they used to be one demon and Amaterasu tries to fuse themselves into the being they used to be, but Tsukuyomi wants to stay by Amaterasu's side as her own person.