Anime ended on chapter 19 of the Manga. 29 current chapters. Threes seasons + ovas. 19/3 = 6.33333. 6 chapters of the manga per season (on average). 10 more chapters. Enough for another season. Although, they did skip over like 3-5 chapters that were basically more conquest. The Goddesses Arc is a good place to stop if they do decide to end it here. Hopefully they keep going with it. I really enjoyed the ending though. Despite the director appearing to be a Chihiro fan, the ending was pretty close to the manga.
Apparently all the assistants were Chihiro fans and forced the author to start her arc earlier than intended. I do like Chihiro, but she did get a bit more focus than everyone else. Perhaps it's because of her "unique-yet-not-unique" status, I suppose?
And they're going to end it here for now. 12-13 episodes is standard, and unless they do more OVAs (likely) to cover other chapters and/or fanservice, we're going to have to wait until there's a definitive conclusion to the current manga arc. Author has been taking an insane amount of breaks lately. Frustrating, but nothing to be done about it.
Even though they sometimes piss me off, Bittersweet endings usually leave the biggest impressions on me.
I do not read the manga (though I plan to) but I thought it was a good ending to the season. Hopefully they decide to do another season.
Bittersweet endings piss me off more than I'd like to admit. I don't need a happy ending either, but any conclusion to any story I'm invested in hits me in a way I don't like. The show stays very close to the manga, honestly, but it's still worth a good read. Only trouble is that you spoil the plot of the anime adaptation.
And yeah, it was a fantastic ending. The conclusion does come up a little too quickly regarding the goddesses, but the focus was never really on the fight so I can overlook that; it's always been about the conquests and the ending.
The thing that Tenri said to Diana about Keima is still a mystery, if you're wondering, and may have something to do with the current manga arc. I'll avoid spoilers, but you should read it.