The world as we know it was permanently changed when the gates to the dimension of the gods and the dimension of the demons suddenly opened. Ten years later, a boy named Tsuchimi Rin is entrusted with two princesses from those dimensions. Can he maintain his sanity while living with his childhood friend Kaede, attempting to lead a normal school life, and serving as a neighbor to both princesses and their fathers, the powerful Dimension Lords? The hearts of those girls are at stake, and only Rin holds the key to unlock them.