If you haven't started playing the game, I'd recommend at least watching the story on YouTube(as well as Alina's and Holy Alina's magical girl stories - she didn't get much development in the central story and her actions in chapter 10 can seem to come out of nowhere if you haven't watched them). There's a lot the anime cut out(such as the entirety of Another Story) and the characters suffer tremendously for it(especially Tsuruno).