Yes, that felt incomplete, it seems like they were gunning for continuation (which hopefully materializes), but otherwise they should have hinted the viewers a bit about that important piece of lore. But then again, I admit that the show's strength lies in its fairly well written characters and the friendship they formed throughout the series. It's what makes it standout beyond the barrage of fanservice they gave us in its runtime. The animation was decent, the music was acceptabls, not the most technically impressive I've seen, just passable enough. Would I recommend this though? Just for giving us a decent relationshp in a genre like this, sure. But if you find explicit content to be a turn off, then it's a pass for you.