Maou to Yuusha no Tatakai no Ura de: Game Sekai ni Tensei shita kedo Yuujin no Yuusha ga Maou Toubatsu ni Tabidatta Ato no Kokunai Orusuban (Naisei to Boueisen) ga Ore no Oshigoto desu

Reincarnated Into a Game as the Hero’s Friend: Running the Kingdom Behind the Scenes

魔王と勇者の戦いの裏で ~ゲーム世界に転生したけど友人の勇者が魔王討伐に旅立ったあとの国内お留守番（内政と防衛戦）が俺のお仕事です~