>>725483347
I started with the first anime. And it's probably the best adaptation of a game I've ever seen. And I've seen a lot going back to the 1980s. I then went and played the game and sure, the game has more world building and stuff. But that's because it's 50 hours of reading dialogue. And let's be honest. Not every single piece of that is necessary. Especially all the extra stuff with Kamyu. The anime adapted 90% of what was necessary. You're just lacking some extra character development and plot for Yuzuha and Kuuya. Kuuya and Sakuya are the characters that were lacking in the anime because they didn't have enough time. Almost everyone else was developed enough. I mean, it says a lot that the characters I liked in the anime were still my favorite in the game. The only exception was I ended up liking Sakuya more after playing the game.

This is all just for the first anime series though. The adaptation for Masks was terrible and should be skipped.