Notes:

Sorry for the questionable picture quality, this was the only decent version of this scene in gif form that I could find without the bra busting off.

I actually can't remember the name of this anime (I only remember coming across this scene during a random YouTube search a few years back, but the YouTube video is gone), but if you know it then let me know and I'll edit the tags and note.

EDIT: The name of the anime is Seikon no Qwaser. Thanks to nyako for letting me know!