Twin Detectives (1999)
Also Known As: Futago Tantei, 双子探偵
Based on a detective series by Hayamine Kaoru. Yumemizu Kiyoshiro, who call himself a "super detective" and twin sisters Ai and Mai cooperate to tackle with problems. Each mystery they brilliantly solve in the end reflects issues that ordinary junior high school students are likely to face. The twin sisters learn many things by solving problems together with Yumemizu.