The Story of How I, a Timid Boy, Became the "True Master"

Haruto, who works at the ward office, receives his grandfather's will. When Haruto visits the secluded mountain house where his grandfather used to live, he meets Ugetsu, a handsome man who claims to be a tsukumogami (a spirit inhabiting an object) of a Japanese sword. "You are my master, and my r...