Synopse
Shinichi Kudou, a great mystery expert at only seventeen, is already well known for having solved several challenging cases. One day, when Shinichi sees two suspicious men and decides to follow them, he inadvertently becomes witness to a disturbing illegal activity. When the men catch Shinichi, they dose him with an experimental drug formulated by their criminal organization and abandon him to die. However, to his own astonishment, Shinichi is still alive and soon wakes up, but now, he has the body of a seven-year-old, perfectly preserving his original intelligence.