He was born in Japan, then studied in London. He is very good at deducing and wants to be a detective and also extremely sensitive about time. His watch can read milliseconds. He asks the question "Why did you commit the crime?" to every criminal he captures. He came back to Japan recently and found the biggest challenge of his life, Kaito KID. He thinks Kaito Kuroba is KID, but he needs to find evidence.
In movie 10, claiming that someone dear to him had been captured by the theme park, he assisted Conan and Heiji in their investigations that day, but later disappeared after they were separated by attackers.