D-kyuu Boukensha no Ore, Naze ka Yuusha Party ni Kanyuu Sareta Ageku, Oujo ni Tsukimatowareteru (Associated Names)

Jirei, the protagonist, thinks that if he becomes a hero and defeats the Demon King in order to become the king, he can spend his days in laziness. To be chosen as a hero, he trained himself to become a hero, sometimes fighting higher-ranked monsters to the death. All for the sake of his future…