Sanae Dekomori

凸守早苗, Deko-chan
A fourteen year old girl underclassman to the rest of the club members. She like Rikka is a Chuunibyou. She claims that she is Rikkas servant and wants to take her masters place. Her power is Mjolnir a pair of hair nunchucks. Despite being a Chuunibyou she is top in her class. Little was known about her relatives but its implied that she is from a rich family. Source: Anime News Network