Kudo is a Japanese con artist who initially operates within Japan, serving as boss and mentor to Makoto Edamura. He guides Edamura in petty scams until their attempt to trick a Frenchman, Laurent Thierry, in Asakusa backfires. Laurent outmaneuvers them, leading to their capture and imprisonment. This event exposes Kudo's limitations against international-level operators.

Following prison, Kudo joins Laurent Thierry's global con artist group, Team Confidence, in a supporting role. While not a core member, he frequently participates in their elaborate cons. His contributions involve playing minor, believable roles designed to enhance the credibility of the larger deceptions planned by primary members like Laurent or Edamura.

Kudo's early involvement is instrumental in Edamura's recruitment into the team. His presence provides a direct link between Edamura's origins in small-time Japanese cons and Laurent's high-stakes international operations. Across the team's cons, Kudo functions as a reliable supporting player, executing assigned tasks without taking leadership or central planning responsibilities. His background is defined by his professional relationship with Edamura and his integration into Team Confidence.