It's a good series, but I feel there was a lot of wasted potential now that I've read it all. The Yuuka-Reisen and Tenshi-Suika-Komachi fights feel too short, and they never explain why going insane also gave Aya a crazy (lol) power up. But the doujin is good for what it is, so thanks for the hard work.
For Aya, i feel there is this notion that she much stronger and smarter than she looks everyday, she just has no reason to show it or prove it. Until she got in the madness wave and her deep desires got amplified, she became really driven to accomplish her goal.