Fantasical

Hiromu is a university student. One day, when he goes through the gate of library, he suddenly moves to another world, Fantasical. When he regains his consciousness, he finds a girl, Mary, standing in front of him. He wants go back at first, but he gradually gets accustomed to it. He starts living at Mary's house and enters high school. As he enjoys his life there, he starts thinking about staying there forever...