Responses
http://www.mangago.me/read-manga/seishun_x_kikanjuu/ has an anime too ヾ(☆▽☆)
http://www.mangago.me/read-manga/seishun_x_kikanjuu/
Im pretty confident its this one. And the girl is not cross dressing. She just gets mistaken as a guy
Looking for a sports type manga. In it, the game is where they use guns to shoot plastic bullets or something like that. The protagonist is a girl who likes to cross dress. She is recruited into a guys only team when her gender was mistaken.