Saitou is a dedicated worker, who does all kinds of repairs, he is able to open all kinds of doors and containers, repair and even build accessories with his tools.
But his life does not seem to make sense, he is even tired of dealing with the clients of the company where he works. He can do things with ease and his job does not seem complicated, and they tend to belittle his abilities, and even dare to demand a discount.
One day, he ends up in a world of dungeons and adventurers, and precisely thanks to his strange abilities, he ends up joining a peculiar group of explorers.
Raelza is a beautiful woman, somewhat shy, but extremely strong. She always covers her body and face with her armor and ever since Saitou arrived, she has been interested in what he tells and the way he does his job.
Also, in the team is Morlock, a powerful sorcerer with great experience, but a short-term memory that makes him forget his spells at the worst moment. And finally, Lafanpan a tiny fairy with great attachment for money.
One day, the group enters a dungeon and finds a series of locked doors, and thanks to Saitou’s abilities, they are able to open all, and when required, Morlock supports him removing a magical barrier.
By opening what would be the chest with treasures, it ends up being a monster, and thanks to Raelza, the situation does not get out of control and she eliminates it with her weapon. At that moment, Saitou notices that Raelza’s helmet doesn’t fit and asks her to give it to him for repair.
On their way back to the village, Saitou observes the relationship between Lafanpan and Morlock, who despite being a good sorcerer, is having aging issues, and now it is not long before something hurts him, and Lafanpan takes the opportunity to charge him a coin for her help.
Saitou observes that Lafanpan regretfully carries her coins, but does not allow anyone to help her carry them. Saitou tells her that if she wants he can make a backpack for her to carry the coins, and when the fairy asks him the price, he asks her to help the old man from time to time.
In town, they visit the shop run by Mavena, who at first glance seems naive, but is able to accurately value the items adventurers sell her, and she does not hesitate to take advantage of the ignorant.
Days later, in the middle of a dungeon journey, Saitou ends up falling into the void, he knows that in these conditions, his companions cannot use magic to search for him. With a broken leg, he begins to get depressed, because he believes that he does not contribute much to the team, and perhaps it is not strange that he ends up abandoned.
But before he can go on complaining about his luck, Raelza, Morlock and Lafanpan show up and tell him that he is a key part of their team.