Because of the wars with other races, humans in the world of Aptra used ancient magic summoned by humans from other worlds to enhance their combat power. However, due to the interference from other races, the dimension collapsed. Monsters from other dimensions appear in Epterra, causing an existential crisis for all races. 66 Years later, the four races stopped fighting, and humans were summoned from another world again on this day.
The protagonist is a sinister sophomore who was summoned to Epterra along with thousands of people, but was looked down upon by the royal family because he was an alchemist. The protagonist slowly improves his level through various methods, trying to survive in this world as a weakling.