M: Beloved One[1] (M 愛すべき人がいて, M Aisubeki Hito ga Ite) is a non-fiction novel written by Japanese author Narumi Komatsu, published on 1 August 2019, by Gentosha.

[2] On August 1, 2018, a year before its publication, a conversation took place in a drinking session with Ayumi Hamasaki, Max Matsuura, and the president of CyberAgent, Susumu Fujita, in Nishi-Azabu, Tokyo.

The conversation became lively, and on the spot, Fujita called Toru Kenjo, the president of Gentosha, saying, "If you turn this into a book, I’d love to make it into a film", thus initiating the project[3][4].

Nonfiction writer Narumi Komatsu, who had experience interviewing figures like Ichiro Suzuki and Hidetoshi Nakata, was chosen to write the book.

In non-fiction works, there are cases where episodes cannot be written due to the presence of real-life individuals, so the author chose to use the novel format.

On the other hand, Masa is continuously trying to prove himself against Director Ohama, renowned producer Tenmei Kira, and label associate Shō Rukawa.