This is a deceptive story, please watch with caution.
The protagonist is a mediocre character, his specialty is "Eighteen Styles of Complaining", but other than that, he is basically useless. Although it is just a waste material, the genius among the waste materials has a mouth, hesitates for certain reasons, and the protagonist's life from his previous life to his birth has been a failure. Don't underestimate the aura of an important weapon, called: 'Protagonist Aura'.
Since the author is a stepmother, the plot has ups and downs (Ni Zou Kai!), Ahem, if you want to know the details, please read the text.