The elegant mahjong debut of a young lady! Saе, a shy high school student who couldn't fit in with her class at a prestigious girls' school, was quietly enjoying app mahjong in the backyard during lunch break when she was discovered by the charismatic young lady Chise, the most popular girl in school. As a result, she ends up teaching her mahjong...!? A青春 (seishun) story of high school girls adorned with tiles, Volume 1!