I am the last person advocating for less mystery or less predictability (at least with the plot in the case of this anime, as the result of encounters with the monsters of this world were clear). However, I felt as though there was a bit too much "new" mystery and not enough building on the "old", or the mysterious reveals already in place. This leaves the viewer with a lot of questions and the worry that the majority may never be answered.
The show really does well in creating a post-apocalyptic atmosphere, and it was very fun to watch our two main characters journey in such an environment. Had it been just that, this might've been an enjoyable, lighthearted at times, heartfelt in others, ecchi-at-times show. However, the last two episodes come out of nowhere and taint the pleasant feelings with unpleasant ones to say the least. To make it worse, the unpleasantness goes on too long, the characters move on too quickly for such an experience, and the ending scene with our protagonists seems to act like what happened in the past two episodes were as important as a filler arc, making the characters feel unreal and not human.
The art, shot composition, and audio were all amazing and really caught and kept the viewers attention. The OP and ED were really good, but I have to say that it was really hard to feel the same way about a clearly happy and lighthearted ED after watching episodes 10-12. Things really weren't the same after that. I really wanted to like this show - I really DID like this show - and I was willing to overlook the suboptimal writing if not for the greatly disappointing final episodes.
Sometimes many shining moments can be undermined by a terrible few. I believe that to be the case for Tengoku Daimakyou. As much as I enjoyed nearly every aspect about the show up until that point, I cannot ignore the ending.
