"Hey guys, please read Sept! It's free anyway!" -Author, probably
How true, haha. This is like, what, the third character from the spinoff manga to make an appearance here? It's getting ridiculous, unless author-san somehow manages to pull off a great crossover.
Anyway, I'm pretty intrigued by Aya's supposed ability to add lifespan to magical girls. That would be a game-changer.