Arashi Nikaidou (二階堂嵐) is a main character in OniAi and 1 other title, voiced in Japanese by Eri Kitamura. The series' music includes "Onii chan Dakedo Ai Sae Areba Kankeinai yo ne Opening Full Lyrics", "OniAi – Ending Theme – Life-Ru is LOVE-Ru!!".