It is said that in a certain corner of China, in the solar system of the universe, the Milky Way, the solar system, there is such a class - Class 81! This is just an ordinary class consisting of more than 30 second grade students. But fate is like this. No one knows how the angel sister in heaven arranges everyone's fate! We accidentally fell into another time and space during an outing, shouldering the heavy responsibility of finding happiness, and being responsible for never returning to the original world! Just like that, the show started...