Shuensha (終焉社) is the manga publisher that Saiki Kuniharu works in. It runs a manga magazine called Shonen Cornac. The chief editor is Onimatsu Goku. Their name is often confused with another publishing company Shueisha.
- Onimatsu Goku - Chief Editor
- Saiki Kuniharu - Manga Editor
- Saiki Kusuo - Manga Editor (Temporarily, in place of Kuniharu.)
- Azuma Moto - Mangaka (Partnered with Kuniharu)
- Shiragami Fudekichi - Mangaka (Partnered with Kuniharu)