Maou to Yuusha Shika Inai Isekai

Overview

[Only the Demon King and the Hero are Inhabitants! A Super High-Tension ☆ Otherworldly Gag!!] Heaven's Grace, a closed world created by a mischievous god, is inhabited by superhumans who have been forcibly summoned from numerous dimensions. Namihira Hajime, an all-too-ordinary first-year high school student, has been summoned to a prison where only the Demon King and the Hero are Inhabitants!! The beautiful Demon King Metanoia! The beautiful Hero Sakura! Led by them, Demon Kings and Heroes attack one after another!! Namihira Hajime, the representative of humanity, begins his life-risking otherworldly life!! A hilarious ☆ Otherworldly Gag Comic is here to be born!!!

Source: AniList