Operating within the feudal-era world of "Grand Jipangu," distinct from the main One Piece continuity, this character serves as the dedicated crime-fighting partner to Chief Detective Luffy. They work together to maintain law and order in their town.

When Buggy the Clown and his Clown Family cause disturbances, he swiftly alerts Luffy and directly participates in confronting the group. He assists in subduing the criminals and even attempts to restrain Buggy himself, though Buggy escapes using a smoke bomb. Later, after the Clown Family kidnaps Onami (Nami's persona), he accompanies Luffy to the river for the rescue, engaging in combat against Buggy's subordinates Hatchi and Gedatsu.

Continuing his duties as Luffy's night watchman partner, he later encounters a fleeing girl named Vivi pursued by the Clown Family. He helps take the injured Vivi to the Pinwheel restaurant for medical aid. Discovering a wanted poster identifying her, he confronts Vivi about her concealed identity, presenting this evidence to Luffy and others at the river and accusing her of deception just before her true status as a princess emerges.

His role remains consistently that of Luffy's active and reliable partner across the special's events, focused entirely on upholding justice within this feudal setting.