Arata Sagimori

Arata Sagimori is a second-year student at Achiga Girls' Academy and a childhood friend of Kuro and Yuu Matsumi. She grew up playing mahjong with adults at the Matsumi inn but stopped after her first year of elementary school, partly because her idol Harue Akado had quit. When Harue returns to the game, Arata agrees to join Achiga's club.