The then-unnamed protagonist, a Japanese vending machine otaku, is crushed to death by a falling vending machine. Then, he finds himself reincarnated in a fantasy world dungeon as a sentient vending machine. He can see and hear but is immobile, with his speech being limited to stock Japanese vending machine phrases, such as "Welcome" or "Too bad". As a vending machine, he discovers he can dispense any item he has bought in his previous life, and can convert such sales to points thus sustaining his existence. He is also able to use excess coins to add additional features to his vending machine body, and is able to choose which items he stocks or the prices of the items. He is also able to use some magical abilities, including a defensive force field. Stuck in the middle of the wilderness, he encounters Lammis, a young busty female who is a hunter. Lammis has a skill known as the Blessing of Might which makes her ridiculously strong, but is still a novice at managing her own strength. The two quickly become friends after he dispenses some food items to the hungry Lammis. Calling him "Boxxo", she starts carrying him around on her back, which allows Boxxo to move, with his weight allowing her to more easily control her strength. The light novels chronicles their adventures as they start exploring the world's dungeon, and the characters they meet on the way.