Wow, wow, wow! What an amazing game! I loved that Eternum reference near the end. Interesting that they mentioned "gameplay footage" though, considering that's not possible... retcons are fun.
I digress, what an amazing story overall! Definitely one of the best porn games out there in terms of story (mystery, thriller, horror, comedy) and characters (actual relationships, sensible choices, etc.), and just in general (comedy, directing, music & sound design, animation, etc.).
The endings were awesome! I just wish there was one more intimate scene with everybody (altogether as well as respectively with the chosen girl) at the very end. The final confrontation felt a little bit anticlimactic, I wish we would've seen and possibly fight that demon creature in the doors vision, and that the Grimoire choosing the MC was more fleshed out, but great ending either way.