Original pixiv submission:
"電車乗ったら占領されてたのしかったです追記：奥の入り口に寄りかかってた子好きです。つきってください"

This version:
"re電車占領途中でいつもあきちゃう" - yasuo1234

Note to moderators: this is not a screencap. This is the second, more refined version of an earlier submission to pixiv, which can be found here:
http://www.pixiv.net/member_illust.php?mode=medium&illust_id=2216413