Instead of advancing and making interesting new story lines, it's the classic "Just add another girl" trope to try and keep the manga from sinking. They already had a dynamic going but I suppose why not form a real harem series afterall.
Thanks for the chapter!
Man... They were doing so well at the "'Try not to turn into a harem series' Any% slow speedrun"
They just had to count to three didn't they?
Jokes aside, I welcome another gal 'friend' to simp for our otaku overlord.