Akujaku reidžó wa deban o sódori suru (E07)

"James is suspicious of Aileen since she knows of his demon form. However, Ribbon's existence and Aileen's words ""I want to protect you"" softens his heart and he decides to work with her on the case. The day of the school festival finally arrives and Aileen patrols the area with James in duck costumes. Meanwhile, Claude tosses his work to the side and goes to the school festival to have some fun. He meets a certain duck again when he entering the swordsmanship tournament." (Crunchyroll)