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Keita’s father remarried when he was young, making Ako and Riko his step-siblings. Despite not being related by blood, the twins have harbored an intense, highly aggressive romantic and physical infatuation with Keita since childhood.

: Instead of standard honorifics, the twins called Keita "Keito-jan," mixing Japanese suffixes with Georgian terms of endearment. Kiss X Sis Qartulad