Kei Arakawa  

, 荒川 憩

Kei arakawa, who attends sangamaki high school in north osaka, is a second-year student and a supporting character in the spin-off manga "saki achiga-hen episode of side-a". she is renowned as the strongest player at her school. despite this, her team loses out to senriyama high school during their prefectural qualifying tournament. in the previous year's high school national individual mahjong tournament, kei finished in second place overall. her exceptional skills have earned her a reputation as a "monster player," capable of challenging both rinkais satoha and teru miyanaga on her own.