Conan: Whose Child?

High school student detective Kudo Shinichi was accidentally attacked while tracking a black organization on a rainy night, and his body accidentally reverted back to his seven-year-old self. Just when Kudo Shinichi was at a loss, he met a lost girl. The girl's name is Song Shiyu. She has a bun and can only speak in a low voice in Chinese with a tearful tone. Looking at this girl who was weaker than himself, Kudo Shinichi, who couldn't protect himself, subconsciously protected her behind him. From then on, his detective career was completely rewritten. He changed his name to Conan Edogawa, and while pursuing clues about the black organization, he also had to protect this innocent girl. Outside, he has to play the role of a primary school student who says "ah lie lie"; when he returns home, he is the only brother Xiao Yu can rely on. And Song Shiyu, this girl who seems to be afraid of strangers and can only call him "brother" in a low voice in Chinese, actually has a photographic memory of language talent, and looks at problems from a different perspective than others. Sometimes when a case gets stuck, a Chinese nursery rhyme she hums unintentionally may become the key to solving the case. He took her in and found new responsibilities for himself. She relied on him and used the purest companionship of a child to warm his lonely life after he became small. On the way to pursue the truth, the two children became each other's only support.