Nobuyuki Osaki

Mr. Tonegawa: Middle Management Blues is a Japanese manga series written by Tensei Hagiwara and illustrated by Tomohiro Hashimoto and Tomoki Miyoshi. It is a spin-off to the Kaiji manga series by Nobuyuki Fukumoto. It was serialized in Kodansha's Monthly Young Magazine from June 2015 to January 2018, and later moved to the Comic Days manga app in March 2018 and finished in June 2020. Its chapters were collected in ten tankōbon volumes. The series comically depicts the struggles and conflicts of Tonegawa, a middle manager who is an executive of the Teiai Group and leads a large number of blacksuits, but is most concerned about the mood of the tyrannical Chairman Hyōdō.