Aku Urus Pangsapuri Raksasa

To save his sick sister, former boxer Victor takes a $100K/day job managing a creepy apartment. He doesn't know the tenants are S-rank world-ending monsters! By punching a succubus, he remotely kills a giant beast, stops a tsunami, and absorbs its power. While earning cash and saving the world, what darker secrets await in the abyss?