After the 18-year-old high school student Sui Chengcheng took the college entrance examination, his parents ignored his wishes and wanted to repeat a grade for him, but he resisted. The black stone necklace was accidentally triggered and brought back to the first grade of elementary school. Sui Chengcheng collapsed at first, but he gradually discovered something strange about He He. In the original timeline, the two of them expressed their feelings for each other before the senior year of high school, but on the eve of the college entrance examination, He He suddenly broke up with him and then disappeared.
But in an accident, He He told Sui Chengcheng the truth: This is a world constructed of black stone, and people will be trapped here. Sui Chengcheng had no time to understand the truth behind He He's departure because he discovered that his sister who disappeared in the real world had been living in this world for more than ten years. The two immediately decided to find a breakthrough together and leave this world.
Before they could make any move, Sui Chengcheng's sister Sui Cheng appeared in their junior high school class (Sui Chengcheng exposed his knowledge base and was sent to junior high school by his father. He He also skipped to junior high school in order not to leave Sui Chengcheng.) The three met formally for the first time.
When the three of them arrived at the exit, they found two people: Jin Ke and Yu Lu. The two of them were also brought in by Black Stone. So the five people formed a team and set out to find the connection to the world.
In the world they experienced during their search, the five of them tried their best to help the Black Stone owners in that world realize their regrets in order to obtain the Black Stone. However, there are worlds where Black Stone does not exist, so the world is in a state of fragmentation.
Intention: the choice of love, family, and friendship