芒咕是动物城里负责给居民们送洗衣物的驴子。动物城的老国王狮子因为年迈打算退位，狐狸说服国王发起一场选举活动，在狐狸的安排下，成天爱做白日梦的芒咕竟然当选新的国王。

In the main character, under mysterious circumstances, the brother dies. The girl begins to pursue realistic nightmares, and she goes to the Institute of Somnology, where she and other patients are immersed in a joint lucid dream. But after dawn, they will wake up in a completely different reality, which is worse than any nightmare ...