My Pet Slime Gives Me 10x Rewards

Vincent Crane has the worst superpower in the world: a Pocket Dimension that stores 90 liters of stuff. Useless in combat. Great for carrying groceries. In a world of super-powered hunters and dimensional dungeons, he is the F-rank mule of a D-rank group. He carries their gear, earns scraps, and gets treated like furniture. Then he finds a slime. Not the kind that slimes people. The kind that devours a single Monster Crystal and spits back 10x the amount. Suddenly, his useless stat growth isn't a problem anymore when he has 10x more resources than any average hunter. But the real game-changer happens when Vincent stumbles upon a Mythic Crystal, a legendary item capable of directly evolving a hunter's superpower. Anyone else would get a single upgrade, but Vincent feeds it to his slime and receives 10x the rewards. His storage increases in size, allowing him to absorb and store attacks from monsters or hunters, creating his own ultimate arsenal. Entering inside his own pocket dimension and appearing in a different location, like a teleport? Yep, Vincent has that too. Dimensional cuts that could ignore defenses? Yes, that too. Vincent realized that his power had endless possibilities, and perhaps his low-ranked ability turned out to be the key to uncover the secrets behind the dimensional rifts! Not only that, but the academy entrance exam is coming. The hunters who ignored him are watching. And the villains who hunt the weak are about to learn a very painful lesson. Can an F-rank underdog bend reality itself? He is about to find out, one 10x reward at a time. — Description from novelcodex.org