Kengo / Shinzo Kengo begins teaching Taiyo about disguises, leading to a misunderstanding with Mutsumi. Weapon specialist sibling Shinzo then gives Taiyo a gift before setting off to take down money counterfeiters. Mutsumi warns Taiyo his increasing abilities are unintentionally scaring their classmates. Mutsumi later notices Kengo's mission paperwork is missing, so she enlists Taiyo's help to hunt him down. Eventually, Mutsumi realizes Taiyo is actually Kengo in disguise, having replaced Taiyo halfway through the search. Now caught, Kengo submits his paperwork properly. Mutsumi takes steps to punish Kyoichiro for the secret pictures of her she found in his room while hunting Kengo...