Shoko Arima

Shoko Arima (有馬 翔子 Arima Shōko) is Setsuna's classmate and constant bully, along with her two friends. Both beautiful and popular, she picks on him to cover up the fact that she has a huge crush on him, something she has a hard time admitting to herself due to her tsundere personality. After jumping him in the storage room only to be rejected, Shoko becomes possessed by a low-level demon and attacks Setsuna. However, Setsuna summons Kanna and Rena, with Kanna easily overpowering the possessed Shoko and Rena able to successfully remove the demon from Shoko.

After finding out how close Setsuna was with Kanna and Rena, Shoko began to see them as potential rivals. As the story progresses, Shoko has slowly started to get her feelings across to Setsuna. In one instant after being drugged, Shoko practically flirted with Setsuna, and while she was half-asleep she said to him that she wasn't going to let Kanna and Rena take him away because he was her "servant".

Even though she is the sole heiress to the Arima Group, she is at odds with her parents and lives alone in an apartment. However, after she became Hina's master due to the Brand of Domination, Hina has moved in to take care of the household chores.