The world as we know it was suddenly and permanently altered when the gates to the dimension of the gods and the dimension of the demons abruptly opened. Ten years later, a boy named Tsuchimi Rin is entrusted with two princesses from those realms. Will he manage to keep his sanity while living with his childhood friend Kaede, attempting to maintain 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.