Tico, a former slave escaped from bondage, joins Jiro's journey. He becomes a core member of the group traveling internationally, including through Russia and America, on the quest for Captain Kidd's hidden treasure. This treasure hunt serves to oppose the Shogunate's plans to isolate Japan. Tico provides logistical support, aiding the group's navigation across territories. His background of enslavement informs his perspective within the narrative. Tico operates alongside Jiro and Oyuki throughout the treasure hunt, collaborating to uncover clues left by Jiro's father as part of the collective effort to thwart Tenkai's ambitions.