When an ordinary college student woke up leisurely, he found himself in a strange mansion, wearing expensive silk pajamas, and eight equally confused girls also appeared mysteriously throughout the mansion. What is even more shocking is that their existence seems to have been silently tampered with by the world - the seats in the classroom are empty, and the "Shi Youran" in the memories of their classmates has been completely erased, leaving only a farewell letter that turned to ashes and a cold warning: "Don't ask, don't explore."
At the same time, the mansion itself, known as the "Fantasy Mansion", is exuding weirdness: an ice crystal cup filled with golden-green liquid appears out of thin air in the center of the restaurant, and temptation/command notes that read "Stay. Belong. Embrace Order." Are scattered everywhere.
The crisis escalates with the ringing of the doorbell. The new neighbors are actually Kudo Yusaku and Kudo Yukiko! They called Shi Youran "Mr. Hakase Kurohara" very naturally. In order to stabilize the situation and obtain intelligence, Shi Youran had to bite the bullet and pretend to be the owner of the mansion who "appeared out of thin air" and invited Kudo and his wife to have dinner.
During their exploration, they discovered a "passage" that transcended cognition and a "mimetic puppet device" in the basement of the mansion. The children "Book City" and "Qing Yu" who mysteriously appeared through the screen revealed that Shi Youran actually had a mysterious and awesome identity, but he himself had no idea about it.
