Ako, Shizuno, and Nodoka were best friends in middle school, often going to Achiga Girls’ School to play Mahjong.  But as time passed, they saw each other less and less of each other.  That was until Shizuno saw Nodoka win the middle school Mahjong Singles tournament.  She is determined to meet her friend again, at the inter-high mahjong tournament!
So this is what they mean 
by "frail city kid."
أظن أن هذا مِثال عن طفلة مدنية مُكَشْكَشة
Así que esta es la niña débil de 
la ciudad de la que había escuchado!
Así que ésta es la debilucha de volantitos de la que había oído hablar...
Voilà ce qu’on appelle
 un « gringalet de la capitale » !
Sei la tipica pappamolla di città.
Então as garotas da cidade grande são assim...