Her name is Rio Tsukatsuki, she's ordinary Girl who's teleported to another world when she's sleeping. As she wake up from sleeping, she realize she's in different room and world, but she's with a Man on the bed when she wake up. She's in more mystical world than her old world. She have long black hair with red eyes, and tall slender body. She doesn't have any family in her old world. She's cautious with the Man she just teleported, but she'll learn that he's not bad guy.