Ryougoku is a member of the Wild 7, an elite police unit of reformed criminals operating outside conventional law enforcement protocols. His expertise in explosives stems from his background as a former safecracker. After recruitment, he maintains legitimate employment at a fireworks company, providing cover for his access to explosive materials. This role directly supports his duties within the unit, where he handles demolition and tactical operations.

As part of the Wild 7, Ryougoku employs a specially modified motorcycle for high-speed interventions. He participates in the unit's collective missions against high-level criminal organizations, including the assault on Ooiwa’s fortified headquarters and operations targeting Kuromatsu’s shadowy media network. These missions involve coordinated attacks using the unit’s signature vehicular tactics and improvised weaponry.

Ryougoku operates under Police Supervisor Katsu Kusanami’s authority but demonstrates the unit’s characteristic autonomy during field operations. He reports directly to Kusanami on mission developments, as evidenced after the unit captured Kuromatsu. His interactions with teammates like unit leader Hiba and fellow member Otto occur during joint operations and strategy sessions at their informal headquarters, the Von coffee shop.