Look... this may be a weird thought, but what if the spirit that was latched onto Yuri is shifted onto Melissa and made her the new main character? It would make more sense why the boys are suddenly a lot nicer and seem to like Melissa. Because as much as I want them to have redemption arcs this seems a bit too fast!
Sidenote: Not that I care, but where the heck did peacock disappear too. Not even the story wanted to have him around for long