Sequels include Division Chief Kosaku Shima, Managing Director Kosaku Shima, Executive Managing Director Kosaku Shima, Senmu Shima Kōsaku, President Kosaku Shima, and Chairman Kosaku Shima.
Hirokane ended the Gakusei Shima Kōsaku (Student Kōsaku Shima) spinoff manga in Kodansha’s Evening magazine in April 2017, and the Gakusei Shima Kōsaku: Jūkatsu-hen (Student Kōsaku Shima: Job Hunting) spinoff then ran from May 2017 to July 2018.
This year’s 34th issue of Kodansha’s Morning magazine revealed on Thursday that Kenshi Hirokane’s Kaichō Shima Kōsaku (Chairman Kosaku Shima) manga will end in the next issue on August 1.
Hirokane and Shin Kibayashi’s Shima Kōsaku no Jikenbo (Kōsaku Shima Case Files) manga spinoff launched in August 2017 and ended in December 2017.