@ Nya-chan You can see her breasts in quite a few panels (below her clothes) - very noticable in her first panel- and even naked boobs in several panels. And I thought her face looked more feminine than masculine.
I agree there are a lot of pannels when its not obvious though - and it would be better if they made it clearer by actualy saying her gender at the start..
You do realize that 'Aki' is a female name, right? Readers in Japan would've gotten all the information they needed right there, removing any need for the author to grab a megaphone go, "This here is a woh-mun." Plus, she's not even all that butch. Y'all need to learn to appreciate androgyny instead of going, "She doesn't seem female enough on panel #5 of page 14 because I couldn't see her double D honkers and be assured that this yuri series doesn't feature a guy." People like to present in different ways, and women who dress in suits and have androgynous, angular features are extremely popular with lesbians, both in Japan and in the West. It's a veritable cultural phenomenon- look up otokoyaku from the Takarazuka Revue.
Seconded! We need more androgynous characters in yuri that doesn't need to have big tiddies in order to be seen as female. Besides, one panel is enough to show you that basic knowledge.