Charon Siphon

A high-school student named Nanatsu Io, devastated by a romantic setback, is drawn into an unusual cafe called "Cafe Acheron" by two male employees, Kiba and Resato. To work there as a waitress, she agrees to a contract with Kiba, the cafe owner, which requires her to keep a now-conscious stuffed bear with her. The bear identifies itself as "Father."