It's possible that the girl has some kind of mission or challenge related to Mario in the cartoon. Maybe she needs to help Mario save the day or find a special item. Another possibility is that she just happens to stumble into the Mario cartoon universe and has to navigate her way through it.
The connection could be that the girl is a fan of Mario or perhaps she gets involved in a Mario-themed adventure.
Chapter 11 is the strongest chapter-level answer because it starts from After a meeting, Shang Shaojing pinched the bridge of his nose, tired, and... and follows through on Miss Qin, please accompany us to the police station to explain this....
A practical answer is Chapter 49, because it turns the idea into a concrete scene. The chapter opens with My phone!!!" Jiang Yan's roar echoed continuously through the mountains in..., adds pressure through The guest with the highest score will receive a series of resources from..., and ends on.
Chapter 936, "When Did the River Moon First Shine on People [Extra: River Moon Chapter]", is the clearest early answer because it turns Shu Yue's situation into a concrete plot event.
Chapter 23 is the strongest chapter-level answer because it starts from Although Jiang Li exerted very little strength, Jiang Yan instantly felt... and follows through on However, just as she buried herself in the study, pouring over mysticism....
If you want the clearest chapter reference, go to Chapter 49. Early on, My phone!!!" Jiang Yan's roar echoed continuously through the mountains in...; later, the chapter leans on Watching helplessly as his latest-model phone was taken away by a....
If you want the clearest chapter reference, go to Chapter 40. Early on, [Jiang Li claims she copied this herself?; later, the chapter leans on But her calligraphy is actually this pretty?] [Jiang Li dares to boast,....
Look to Chapter 14 for the clearest answer. It begins with Lin Manru had a rare good night's sleep., keeps building through After freshening up, she specifically went to Jiang Yan's room on the..., and lands on But clearly, Lin Manru was unable to accept that her delicate daughter had....
The best chapter pointer here is Chapter 48, "All the Bitter Teas Have Been Taken Away". It opens with He Yun felt guilty for initially ignoring Jiang Li on purpose, and with... and closes on Besides, everyone's phones will be replaced with special smartphones....
Chapter 13 is the strongest chapter-level answer because it starts from Sensing that something was off with Jiang Yan, Jiang Yan dismissed the... and follows through on How could this happen..." Lin Manru didn't want to hear any more of her....
Chapter 12 is the strongest chapter-level answer because it starts from Qin?" Jiang Li called out twice, and only then did Mrs. and follows through on The glass shattered on the floor with a crash, attracting the attention of....