An unexpected find. While there are few CG, this game just does gradual corruption very well through dialogue, voice acting (impressive as the seiyuu for the main girl is either amateur or using a new pseudonym, and the other two aren't particularly experienced either), and general atmosphere. You can just tell this was done by a dev that actually likes mind control/corruption themes and magical girls, unlike some bigger games that seem to add shit just for the sake of filling a checklist of popular topics. I'd say it's more for people that get off corruption itself even without many sex scenes. It's also very short, and could have used more (I'd like to see more of the blonde girl's corruption), but for what it sets out to do and as a first game of a clearly very amateurish circle, it excels.
Also the same circle just released another corruption game but with a stock super robot scenario and instead of magical girl. I can already tell whoever is in charge and I are like-minded people. Hope it's as good as this one.