In order to go back to the past, Guan Chao tries hard to find the "burning stone" that activates the time gun, but accidentally falls into the Memory Management Bureau. Only by conquering the BUG people in the memory layer can he return to reality. With the help of administrators such as Fangtang and Baizhong, can Guan Chao successfully complete the task? What kind of challenges are awaiting Guan Chao in each memory layer...

During the An Lushan Rebellion of the Tang Dynasty, monsters are everywhere and the people were destitute in the Central Plains. Li Haobai started from the Bashu and wanted to go to the front line to make a meritorious deed. On the way he was swallowed by the monster. By coincidence, Li Haobai and the guardian of the dragon’s veins merged with each other to obtain the power of the black dragon. And he has since been involved in the struggle of various forces.

Uta Sakura is a lively and energetic middle school student who loves singing. One day, while walking her dog, she encounters a cute, peach-like fairy named Purirun, who is searching for the Legendary Protectors "Idol Precure." Purirun's hometown, KirakiLand, was a peaceful, sparkly place but has been forced into darkness by the villainous Darkine, leader of the Chokkiri Gang. Uta decides to help Purirun search for cheerful and happy people to become the Precure so KirakiLand can become bright again. Suddenly, the Chokkiri gang arrive in Hanamichi Town, Uta's hometown, and steal the sparkles from the townspeople. Uta decides to illuminate the darkness with sparkles from her song and is granted the power to transform into the Legendary Protector, Cure Idol.

The story is set in a town where animals and vehicles live together. They cooperate to protect the townspeople from various troubles that emerge.