Omoikkiri Tanteidan Hadogumi (aka The Eager Detective) was created by Shotaro Ishinomori and produced by Toei. It was inspired by Edogawa Ranpo’s fictional character The Fiend with Twenty Faces. It ran for 50 episodes throughout 1987.
Hiroshi, Satoru, Susumu, Takeo, and Yasuko are five unique children who have different talents, such as being skilled at computers, being an expert at throwing stars, and excelling in studies and sports. The leader of this group, Hiroshi, creates a fictional character, the phantom Matenro, on his computer. When the five children shoot a video about this phantom and play it in their school, a small problem emerges.
That evening, when Hiroshi finds that his precious computer is gone, Matenro, who had been a fictional phantom, appears before him and his friends. “If you want me to return your computer, accept my challenge,” Matenro says, challenging the children. This challenge leads the children to form their own detective squad, “Hard Gumi.”