This is a tale of the protagonist who was being summoned to protect the demon king from the hero.
Kuroki who’s suddenly summoned to another world. The one who summoned him is the demon king, Modes. And, the territory which currently ruled by the demon king was in the middle of being destroyed because of the hero.
The demon king Modes who has atrocious appearance is bowing toward Kuroki.
「PLEASE SAVE US！ ！ SAVIOR_DONO！ ！ 」
Kuroki then decide to save the demon king due to the turn of event.