Ep. 9: Akechi and Kobayashi work together to solve the formula for ending the Twenty Faces case.
Aired on September 4, 2015

Akechi dedicates his time to determining the formula he and Namikoshi developed to resolve the Twenty Faces case. Kobayashi, intrigued by the formula, skips school to assist Akechi with his work.
Episodes
- Ep. 5 · Twenty Faces explains his motivation for operating outside the law to punish criminals in an interrogation room.
- Ep. 6 · Akechi faces chaos when Kobayashi adopts a stray kitten and Shadow-Man appears.
- Ep. 7 · Akechi and Nakamura investigate Panorama Island as the fourth Twenty Face appears this month.
- Ep. 8 · Akechi Solves Panorama Island Crime and Reveals His Past to Colleagues
- Ep. 9 · Akechi and Kobayashi work together to solve the formula for ending the Twenty Faces case.
- Ep. 10 · Namikoshi reveals his survival and past collaboration with Akechi on the formula
- Ep. 11 · Namikoshi utilizes Twenty Faces to challenge society while Akechi races to intervene.