Yes, I got all the pieces and now the game music was playing in rewind but I tried many times to get the 2 bodies close to the ritual so that I can put both in but it didn't work for. Aside that I really enjoyed the game that's why I spent so much time on it.
although we didn't get to implement a stronger connection to lore, we wanted to have it so that the weeping girl was the protagonist's friend (denoted by the "朋友" decal near her character). Upon learning that you need 6 bodies (after collecing the pages), the idea was that you now have a reason to kill even your friend. We never actually had the time to show this more clearly, as we wanted to finish the entire game within a week, and we also haven't playtested this, but I hope this ending still works!