Rikai no Aru Karen-chan - Ch. 45

[MangaDex]

 

[Ohinu]

i dont get this one

 

[bowser_communist]

i dont get this one

Probably a thing they do in Japanese highschool since thats a school swimsuit.

 

[lesseffective]

Is this implying that she hasn't grown very much at all since her high school days?