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Frank's mind was confused. He had only come to this world out of an accident, he had just wanted to create a Monster Pet Nursery to keep his monster pets there and more… at the end, he ended being transported to the world of Gaia by the powers of this building, which was connected to this world.
Back then, he never thought about it too deeply. However, the Emperor revealed to be someone that knew him but at the same time had missing memories? Just who was he and how did he knew about his father and even him? He even knew right away that he came from another world, and also he spoke about Fate, as if Fate itself had somehow aligned for this moment.
He spoke about a Key to other worlds where… pieces of himself were scattered, very similarly to his own, but at the same time, these pieces had become people which somehow were communicating with him between worlds and were all plotting… something about opening a key to the worlds within a "Cosmic Map"!