Inshoku Ou Demar

Rosalia is an adventurer who once drove demons alongside the heroes. Now retired, she runs an orphanage in a remote area where she leads a peaceful life.

One day, Rosalia finds an insect in the orphanage. However, the latter happens to be a fractional body of Demar, the king of lust, a powerful enemy that she had defeated when she was an adventurous.