On the eve of the school anniversary of Luoyan No. 1 Middle School, the oldest school in Luoyan City, a group of friends came to the air-raid shelter hidden in the school for various reasons. As this adventure began, many strange things happened around them. Crisis has also begun to quietly come to the city. What is the connection between these things? What will be the fate of these people? Can they understand their true colors through all these things?
What we understand about this world is only the most superficial part of it, and there are many, many things that we cannot understand at all. However, more important than all the unknown mysteries is the feelings between people and the love between people.
Love is our eternal theme.