A high school student that has lived as a mob-character Mimori Touka ().During the school trip Touka and his classmates are summoned to another world.According to the summoned goddess, summoning so many best ranks like S-rank and superior ranks like A-rank heroes like this is very unusual.However, Touka was the only one with the lowest rank: E-rank – an extremely low status compared to his classmates. Thus the former mob-character and abandoned hero, will absolutely become the strongest devil as he advances and strikes back.