Exorcist to Kubiwa no Akuma

A powerful demon named Almadiel awakens in the modern era but is confined to a child's body by a sealed collar. She ends up staying with a priest named Shuuto, who appears to have no intention of freeing her and instead treats her as his own. The story is a comedic four-panel series focusing on the dynamic between the helpless demon and the priest, whose actions suggest a twisted sense of control.