Sakura

She appears to be a fluffy and gentle girl, but she's actually a bit sinister. Her last name is unknown. She infiltrated a group (the Game Club) that was making noise playing games in the cafeteria as a "circle crusher" to drive them out and tried to bring down the Game Club. She also suffered from stalking by one of the members. However, the stalker was repelled by Hayase Nagatoro, and it seems she made up with the members of the Game Club afterwards. She continued to stay because "they care about me," and now she acts as the "princess of the Game Club," centered around Sakura, with a group of five.