In a suspenseful and supernatural world, the famous detective Kudo Stern is chased by a mysterious man in black when he returns home. After a fierce struggle, he rolled down the mountain and fainted. When he woke up, he found that the man in black was still searching. He hid in the hut. There were X pills on the table in the house. He took X pills to transform the elementary school student. He needed to take side effects pills to recover. He took them to avoid pursuit and changed his name to Edogawa Kaisen.
After Kaisen entered elementary school, he met a small detective team composed of children. He joined with a playful attitude. In fact, at the age of 24, he far surpassed the children with his knowledge and wisdom. His fellow Detective Conan, Dr. Ari, is good friends with Dr. Yak, and the doctor's inventions, such as transmitters and voice changers, help him solve crimes. He sometimes lives at Dr. Yake's house, and more often at Tingting's house. He also helps Tingting's father's detective agency become famous.
He encountered the Kaitou Kidd incident and the Detective Conan incident, which were full of challenges and suspense. Every time there is a death case, Kaisen can always find the real culprit with his insight and reasoning, such as Yax who wakes up after sleeping.
There are two girls, a fat boy, a skinny boy and him in the little detective team. Although the other children have a playful attitude, Kaison treats the case professionally. A girl in the group also took X pills and had a different experience. Tingting's full name is Yasiting, she is the girl Kudoste likes.
