Gensou Airly is a group featuring the Vocaloids Kagamine Len, KAITO, Camui Gackpo and Hiyama Kiyoteru. The group was created by Pantan-C, Pantan-D (also called the Pantans) and Ayaka. Most of the songs from this group feature Len, KAITO, Gackpo and Kiyoteru. However, one of the songs, Battle Royal Valentine, features MEIKO, Hatsune Miku, Kagamine Rin, Megurine Luka, GUMI and SF-A2 miki. This song is a prequel to the song Your Highness☆My Princess. Battle Royal Valentine is about the girls preparing to "battle" against time and other girls to give chocolates to the boys on Valentine's Day and Your Highness☆My Princess is a reply to this song.

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