Osananajimi no Ohimesama  

幼馴染のお姫様, Osananajimi no Ohime-sama, My Princess Childhood Friend

Friendship vs. love?! A love triangle romantic comedy about being caught between two princesses!! Shunsuke and Hinaki are childhood friends who entered high school together. Theyve always been good friends, but their new classmates mistake them for lovers?(Source: Akita Shoten, translated)