"Takemoto," who thinks that the real world is boring, gets reincarnated into a different world that he had longed for. But when he was about to be killed by a goblin, he got rescued by an elf knight Lelesia and a young cat girl warrior Yoto. They are adventurers seeking a dungeon which houses a treasure that can grant any wish. Takemoto decides to go with them. Since he cannot fight, he carries their luggage instead. At first, they do not care about him. But he gradually gains their trust and is recognized as a friend. One day, in order to help Lelesia and Yoto who get caught in a lewd trap in a dungeon, he has sex with them. At that time, for some reason, the girls become stronger. Takemoto learns that he has the power to make the girls stronger if he has sex with them. Thus, to become stronger, they have sex repeatedly while aiming for the treasure at the bottom of the dungeon. Meanwhile, their feelings begin to grow, as they seek each other out more and more.