The Daughter of Twenty Faces - Season 1 Episode 4 Aspirations of a Thief
Overview: As the thieves continue to train Chiko in various skills relating to their line of work, Chiko has yet to participate in any missions. When Ken is injured, Chiko steps up, despite the reservation of some of the thieves, and successfully accomplishes her role in the theft, establishing herself as a member of the group and her new family.