An angel flew down to me... and she wouldn't shut up about a Mya-nee
After I started reading the manga, I discovered it had an anime which was currently airing... so obviously, that was my next thing to watch, as soon as it had finished airing (I don't like watching stuff whilst it's airing, because I can't watch it all in one go), and that is exactly what happened.
I'm not going to lie, apart from the last episode which hadn't been translated in the manga yet/was not in the manga, everything is very much the same as the manga. It's good when stuff is true to its source material, however Watashi ni Tenshi ga Maiorita!, or Wataten, didn't really flesh it out.
When watching something I've read the manga on, I expect it to be the same story, but breathing life into the characters better than my imagination could, or adding the odd scene here or there which adds to the story. However, Wataten doesn't do that. Apart from the last episode, I didn't see anything I hadn't already read.