Wow! Thanks for the ending video! I actually believed 90% of the time that that guy who summoned me was up to something bad as the magical girl said, but I thought there was about a 10% chance that he might be "a little scary looking but actually a nice guy". But now I know the answer, thanks!
Again, I'm writing this to say that I really enjoyed the fact that the synthesis not only gives you buffs, but also changes the appearance of the girls, and the changes on the map also vary from area to area, which I felt was very carefully crafted. A few bugs in the game never detract from how good it is, you know?