Tono Futanari (Kanata) finds a strange box from the house of Mana, a childhood friend. In the box there are real people living, and when looking closely it was a medieval Japanese world. While continuing to observe with curiosity, at one time, I saw a girl being attacked by a fraud in the box, and I killed the fight unintentionally. Shaken Ueda heads to her house to consult with Mina. However, Mana's father can tell the unexpected fact. "There is no girl in my house".