The story takes place in a modern city called Haijing City in 20xx. Eight years ago, a facility called Aikaia was ostensibly an orphanage, but in fact it was a research institute that used orphans for experiments. A group headed by Dr. Ye Yuan is studying a mysterious power from another world and trying to reproduce it in children. In the end, Dr. Ye woke up and wanted to stop this behavior, but his deputy Du She couldn't bear it, and the two eventually fell out. Some of the children who were experimental subjects, led by Xiaolu, successfully escaped from the facility with the help of Dr. Ye. Xiaolu followed Dr. Ye's words and came to a manor on a mountain in the suburbs. The manor was called Mengshe. Under the care of former Aikaya cleaner Zhongbo and the leadership of Xiaolu, the children survived in secret relying on the property left by Dr. Ye. It was not until eight years later that the children in Mengshe reached the age where they had to go to school, so Xiaolu decided to let the people of Mengshe get in touch with Haijing City, and Du She has not given up searching for the children of Mengshe over the years. In this way, the story of Mengshe and Haijing City begins...