Ngl, genuinely surprised Saitama was here xD also surprised that the plot would go in that direction - seems like Void fell for his best friend’s girl, if not wife. That god creature does have a knack for getting into one’s desires. That said, maybe there was a “promise” of being with her.
Perhaps it can also be interpreted as Void’s regret. Maybe he liked the girl and didn’t pursue her, or something happened that he couldn’t save her. Unless, this is Void’s sister? I think it’s way too out there but ain’t imagination great xD
(づ ̄ ³ ̄)づ