The young Mizuno Mai is the result of a relationship between a spirit and a human being. From the beginning of her life, she has been trapped in some mysterious and curious worlds defended by some living beings called "Guardians. " Her birth broke god's rules and her grandfather will be chasing her to erase her existence and everything around her as part of a personal revenge. Because of that, and with a bit of help, she will be able to travel to the past, present and future, and grow in a lot of ways to face her fears. Meanwhile, you will discover more than a simple reason like that. She will fight monsters, demons and a lot of other souls... and a mysterious God is behind all of that. Mai will try to uncover the truth of his strange world.