Regarding the Fact That Only I Lack the Qualifications to Be a Hero Despite Being Summoned as One (Pre-Revision)

Hattori Yakumo, a self-proclaimed ordinary and unlucky boy, was suddenly summoned to another world along with his entire class. Unlike Yakumo, who has no magical aptitude, all of his classmates are high-spec individuals. And unfortunately, in a job aptitude diagnosis conducted with a crystal, his occupational suitability is displayed as Demon King. Due to the king's scheme, Yakumo is sentenced to execution and is thrown into a great pit called the "Dragon King's Mouth." Yakumo, resigned to death. However, through various encounters at the bottom of the pit, Yakumo's dramatic reversal begins. Everything is for the sake of the friend who tried to help him. To find a way to return to his original world. And to protect those who admire him, Hattori Yakumo races across the lands of another world.