like she needs to diet (as she is in the show she could stand to eat a hamburger or two.... how else is she supposed to grow a rack that would distract Jin from Nagi and Zange?)
This girl is Hibino Tamami (日比野球美), m510's pixiv project character. Tamami's original illustration was pixiv #1990042. (deleted) Apparently it is now on m510's TINAMI account. (tinami #253020)