This is the love story of Tsunayoshi Sawada, the 24-year-old Tenth Vongola Boss, and Gu Lu, a lucky, ordinary 24-year-old writer.
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One day, Gu Lu, one of the story's protagonists, wakes up to discover that she's become younger! For no reason at all, her body has shrunk from 24 to 14, turning her into her own self from ten years ago. Wow, how great, I'm young again! I can relive my youth!
Gu Lu: (screaming) No! I absolutely refuse to take the college entrance exam again! Please, just turn me back!
Meanwhile, all the way in Italy, the Tenth Vongola Boss, Mr. Vongola, finds himself in the same situation as Gu Lu: his body has shrunk by ten years. Fourteen-year-old Mr. Sawada takes it in stride: "Well, since this has happened, why don't I go on vacation and get some rest?"
So, at her father's suggestion, Gu Lu travels to Italy to find out what caused her to shrink. There, she meets a fourteen-year-old boy Sawada, "wandering" the streets.
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P.S.
1. This was written by someone with a one-track mind about romance. Don't overthink it.
2. The idea of the male and female leads meeting after they shrink, as well as the inspiration for it, came from Ruotongyan's Crossover: Age Is No Problem. (By the way, could I be accused of plagiarism for using the same idea, or do I need permission? I'm not sure about this, so please tell me if I've crossed a line.)
3. Sweet! Sweet! Sweet!