In a peaceful life as a student in Japan, Totska Yukiichi was suddenly caught up in a class summoning to another world as a warrior during a school break. There, he hears a mysterious voice. The country that summoned Yukiichi and his classmates asks for their strength as warriors to save the world, promising them generous treatment and security. However, thanks to his classmates' words, he gets a chance to think about how to act, and leaves the castle to check out the world. As a result, instead of receiving preferential treatment, he decides to become a soldier and build his own achievements to become an adventurer.