Aoi Torino works part-time as a maid at Reimi Itsushiro's residence while studying piano at the Music University's Faculty of Piano. Her duties encompass both household support and providing companionship to Reimi, cultivating a relationship resembling that of an older sister figure.

She possesses purple hair styled in a short half-updo and purple eyes, featuring a mole beneath one eye. During work, she wears a black dress, maid headdress, apron, long sleeves, and white pantyhose. Casually, she is seen in a purple shirt tucked into a red skirt, sometimes with an aqua jacket, accessorized with items like a necklace, and occasionally carries a backpack.