There is something strange in the world. If you're walking around the town and you're in an event like that ... Hidema Imaizumi plans to run away from the house to see something interesting. And then I met a mysterious girl, a black-haired mill. After all, Mill is an unusual girl who can talk with youkai from Japan, Western China, and ancient times. Hide, who was alive in the mansion life, decided to go on a selfish journey with Mill as soon as he was waiting ...!?