There was a white light in the room, and the boy came to Elsa's bedside and sent her an invitation to travel to the dreamland. Not only a dream, but also traveling through time and space through dreams? ! The mermaids of Atlantis, the secrets of the Sky City, the secrets of Victoria and the beautiful and dangerous blue butterflies in dreams... Dreams and reality, the past and the future, and the darkness that has been chasing them, hit the deepest fear in their hearts. Is the place we are in a dream or reality? Have you ever had a strange visitor in your dreams?