(Spoilers for both this game and the prologue)
Kat’s… cameo thing? in the true ending makes me think that the ending of Project Kat was misleading, and she actually isn’t really dead. I also think there’s plenty of evidence to suggest that Sai may be Kat’s brother, so there’s a good chance we’ll see Kat again in Chapter Two, or at the very least hear of her! I love her character too haha