A chipper and bright young girl was enjoying herself on her crepe hunt when she suddenly enters a pastry shop only to find herself walking past the pearly gates and in heaven right before the awesomely majestic throne of god. A booming voice speaks out to her and proclaims itself to be the one true god of her world and that she has been summoned to serve as its new prophet.
The girl is bewildered at first but a few single worded queries and confirmations later, she gladly accepts and tells god that she'll do her best to spread the new word. God is surprised at how quick she was to accept the task that he audibly fumbles around and the sound of a mic dropping to the floor rings out over the heavenboomer. The girl's sharp senses pick up the source of the noise and zeroes in on the location only to freak out the cute little blond girl hidden behind the cloud curtains that was reaching out for the mic. Crying and squeaking, the blond pleads for her not to pay any attention to the person behind the curtain only for the MC to ignore her and start taking pictures of the adorable creature before her.
As it turns out, God has left the universe and put his little sister in charge of fixing the mess he left behind and this little goddess has issues with behaving in any sort of way, godly. Blondie apologizes for the trouble she's imposing on her and promises MC that she'll reward her with anything she wants if she helps her spread her message in the world but unfortunately for her MC demands, point blank, that she becomes her little sister and lives with her while she spreads the word of this shy and timid new goddess. Hijinx, blasphemy and heresy are abound for this tale of the new new testament!