屍王の帰還～元勇者の俺、自分が組織した厨二秘密結社を止めるために再び異世界に召喚されてしまう～ (Associated Names)

Once, there was a hero named Shio Hizaki, who saved another world. All his classmates who were summoned together with him died, and after defeating the Demon Lord, he was forcibly sent back without any rewards. Overcoming a gruesome past with the support of those around him, he graduated from high school. Shio was once…