The long-awaited new work of Momose Wataru, the author of the highly acclaimed anime "Romantic Killer" which is currently airing on Netflix! The story follows Yuuhi, an elementary school student who is home-sitting alone every day. One day, all of a sudden, his neighbor, Mr. Aoi, who lives upstairs, falls in his room leaving a hole in the ceiling. Yuuhi finds out that his neighbor is a cool looking man with a secret side he doesn’t want anyone to know. What does he want to hide so badly? The comedy about a good-looking gangster and a kind-hearted boy and their secret is ready to start!