100-nin no Eiyuu o Sodateta Saikyou Yogensha wa, Boukensha ni Natte mo Sekaijuu no Deshi kara Shitawarete Masu

The story follows Eisen, a powerful strategist who saved the world by raising 100 heroes and defeating an evil god. After sustaining a severe injury while protecting his heroes, Eisen travels to the Other World to recover. As he recuperates, his heroes use their abilities to greatly contribute to the development of the world. Missing his heroes, Eisen reads their letters detailing their achievements and decides to set out on a journey to visit each of them as he travels the country, sightseeing in the process.