Hey Remo, I have been dealing with this issue for a while. I have completed all the night scenes with christa but i still have not been able to have ymir catch me. Let me know what i can do to get past this. Thanks!
Also christa is the last character that i need to advance. I dont know if that helps
Then you haven't unlocked all night scenes with her, obviously. There's a specific night scene you gotta do.
