Marginal Prince: Gekkeiju no Ouji-tachi - Tokyo Merry-Go-Round

マージナルプリンス -月桂樹の王子達- 第14話「TOKYOメリーゴーランド」

Keita and the other Marginal Prince are away from St. Alphonso Academy and meet each other in the city, where they meet Keita's sister. Extra episode released with the 7th DVD volume.