These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Ending Fatigue - The show follows a standard Sorting Algorithm of Evil up until the climatic death of Maaen in episode 38. It then becomes clear that, either for creative or budgetary reasons, the show did not have a new villain or gimmick to fill the gap until Batsu's introduction in episode 49, so it just Handwaves Maaen back into existence and brings back a parade of the previous villain gimmicks.