After Yoshiharu Moriyama's bandmates abandon him mid-performance, he is shocked and touched when Mr. Kanda, Mr. Hibino, and Mr. Kagenaka appear to play with him. Mr. Hibino has a concert overseas, so he asks Mr. Kanda to watch Marin while he's away. Yoshiharu is contacted by an agent who tells him they want to sign him if he makes Mr. Kanda a permanent member of his band. While abroad, Mr. Hibino crosses paths with Geoffroy Lambert, the son of the one of four world-renowned pianists, and Geoffroy tells Hibino he wants to study under Kanda.

Printed Manga-style; book opens from left to right. Pages are read from right to left. "First published in Japan in 2020 by Square Enix Co., Ltd."--Colophon. Cover title. Translation of: Ojisama to Neko 6.