Sanae Dekomori

Sanae is an underclassman to the rest of the club members. She, like Rikka, is a Chuunibyou. She claims that she is Rikka's servant and wants to take her master's 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 it's implied that she is from a rich family.

(Source: Anime News Network)