Japan is actually kinder to foreigners than some other East Asian countries. Nevertheless, it is still VERY hard to assimilate and you will NEVER be a full member of the society. You will always be an outsider to some extent. But plenty of "lifers" usually manage to spread roots, become a part of the local scene, have friendships and relationships, learn the language, etc. Calli appears to be trying to fit in. And it is HARD. It is absolutely an uphill battle. And it is very easy to slide back into hanging out in the EFL bars, getting hammered, and getting by with "survival Japanese." I actually respect her for trying and persisting, even when her reasons for going to Japan didn't pan out. That black hole that is the expat scene is always going to exert a suction pull on her.
And those landwhales you mentioned? They are some of the worst you'll find in the expat "communities."
Changing subjects, as for Gura, right now she seems sober.
Still, we got three potential timebombs in EN. I doubt Gura will melt down like Calli or Kiara might but if she's not careful, she could find herself "dying a little more inside" like she said about her Senzawa fanbase a year ago. I don't expect any meltdowns from JP due to cultural differences and NEET/hikkikomori tendencies, but my most likely candidate for a JP meltdown is Matsuri.