Motoko Tsutsumi

Motoko Tsutsumi (堤 茂斗子)

Moriya's younger sister who loves to tease people. Like her older brother, Motoko is a graduate student enrolled in Nerima University's school of robotics engineering. Motoko lives alone, but she's a bit of a princess and she often returns to her parents house when she gets bored. (Source: Crunchyroll)