Dear sir Hannibal

Kibayashi Rento is a 'personification' of a supernatural being descended from a family of Ents (tree-oak people). One day, his arm got torn off trying to save a cat from a tree. While he's looking for the arm, he crosses a girl, Kurashina Saya, who finds his lost arm. Saya is Rento's crush, and actually a fellow 'personification' descended from a...