I'm trying to find the artist behind the illustrations

I'm been searching for the artist behind the character designs/illustrations, I just love the art style so much and I want to see more of it but I legit don't know who it is

Does anyone know if the person has an Instagram? X? Literally anything LOL

I've seen that there is an art book but unfortunately it's been sold out. Is there any way I could still get one? Just trying my luck here