Shueisha will release a spinoff novel of Yuuto Suzuki’s Sakamoto Days manga titled Sakamoto Days Koroshiya Blues (Sakamoto Days: Assassin Blues) on December 4.
Misaki also wrote the manga’s first novel adaptation titled Sakamoto Days Koroshiya no Method (Sakamoto Days: Assassin’s Method), which shipped in Japan in April 2023.
The manga’s spinoff titled Sakamoto Holidays launched in Shueisha’s Saikyō Jump magazine on July 4.
The manga is inspiring a television anime series in January 2025 starring Tomokazu Sugita as Taro Sakamoto.