Keiichirō Nagumo was a genius high-school detective. No case was complex enough for him. But what happens to genius detectives when they get older? Now 35, with bad hips, running a failing detective agency with no cases to solve and struggling to pay the rent, he's at a dead end. In comes a high school girl in his office who says she wants to work with him. With her help, will the out-of-touch, old-fashioned Nagumo get back the fire of his youth?
| Directing | Rion Kujo | Series Director |
| Writing | Masakuni Igarashi | Comic Book |
| Art | Masakuni Igarashi | Original Series Design |
| Sound | Taiiku Okazaki | Theme Song Performance |
| Writing | Rintarou Ikeda | Series Composition |
| Visual Effects | Isoroku Koga | Character Designer |
| Visual Effects | Isoroku Koga | Supervising Animation Director |
| Sound | Yasunori Ebina | Sound Director |
| Sound | Hiromune Kurahashi | Sound Effects |
| Sound | Tomoki Kikuya | Original Music Composer |
