竹井 久

Hisa is a third-year student at Kiyosumi High School, and plays the lieutenant (3rd) position on the team. She is the president of the mahjong club, as well as the student congress president (she keeps insisting others to refer to her as this). Her history is a bit shady as when she was younger, she went by the name of Hisa Ueno and during a tournament (in which she played with Mihoko), she mysteriously withdrew despite being near the top of the leaderboard. 

Outside of an important competition, Hisa sticks to playing a rational style of mahjong, much like Nodoka. However, during key moments in such tournaments, she relies on bad waits because she feels that she always wins with them. She likewise believes that there is a meaning to each tile you grab, utilizing the flow of the game, and changes her hand accordingly. Although not as skilled as Jun at sensing flow, she still has a very good grasp on it, and picks her moments to declare riichi and win.

Hisa is shown to be a great leader both while playing mahjong and outside of it. Hisa is very caring for her underclassmen like when she comforts Yuuki after her defeat in the prefectural tournament. She has good foresight and can be very scheming. She is shown to have great confidence in her mahjong ability and will not back down from a challenge. However, she did waver during the national tournament's second round but recovered soon after. Opponents have described her as having bad manners due to her slamming of the tiles during matches.