Sister-sama no Oose no Mama ni
シスター様の仰せの魔々に
A demon named Claude appears before Sister Chris Ibarakawa, a novice nun, and reveals he made a contract with her estranged father. The father's final wish was for Chris to live a happy life. Despite being a demon, Claude is exceptionally serious and promises to use all his powers to ensure Chris's happiness. The question remains whether Chris can continue on her pure and righteous path with such an unusual arrangement.