Nagumo Hajime is an ordinary male student who doesn't have any ambitions or aspirations in life, and so is called "Incompetent" by his classmates. One day, the class is summoned to become heroes and save a country from destruction!

Students of the class are blessed with cheat specifications and a cool job class -- however, that's not the case for Hajime, who is given the profession of a "Synergist," and very mediocre stats. "Synergist," to put it in another word, is just artisan class. Being the weakest, he falls to the depth of the abyss when he and his classmates are exploring a dungeon. What will he find in the depths of the abyss, and can he survive?