Nadeshiko with her friends reminds rather students in university than in high school. They look very reliable, maybe Namori represents them like herself (espescially in Megumi) or people she works with. Himawari suits Nadeshiko’s company btw.

pic

Meanwhile YRYR characters I can easilly imagine in high school:

YuruYuri + High School = Yuyushiki

Especially Yui, lol