..... so earlier on, it was mentioned that the myths of this world included a myth that delice's namesake (kaleid) ate three gods, leaving only the earth god untouched. delice is...pretty obviously not human (who tf can fly??? or ingest literal poison that is supposed to kill the average human) and bella is Really Obviously the woman/goddess that appeared before larin when she died in her first life. at the very least, her appearance is exactly the same, so she has some connection to not-human, world-crossing beings.
i'm assuming delice isn't just a descendant of kaleid/someone named after kaleid; i'm guessing he IS kaleid (hence why he can use fire; from the fire spirit/god i guess), and bella is the earth god that he didn't eat, which might be why she hates him (assuming, as the earth god, she had some close relationship w the other gods). though red hair/eyes makes me think fire, and that would bring up more questions...
i do wonder if delice and bella have any memories of it if that's the case. maybe they're reincarnations or sth...