&Quota; The world is composed of floors connected by stairs. The floor is composed of rooms connected by corridors. When you put all the floors together, you have this world;. This is the theory expounded by Toto. Toto is a friend of Siamese twins and the second son of a child. His mother locked him up in a huge family estate, where he was imprisoned from birth. Between exploring endless corridors, private courses, and visiting their father's tomb, the brothers never questioned the limitations of this world. Until one day, they were captivated by a strange light they accidentally caught sight of and swore to find its end.