Imagine the mangaka pitching his idea the first time to the editors: A wholesome house houseband ex-yakuza heartfelt comedy for all ages.
In a contemporary world littered with isekais and, This light novel titel doesn't have enough characters yet, so I put some character into your characters, so you can character some characters to get in character,
*insert old xzibit meme here*
They probably laughed at him at first, but who wouldda guessed it would turn out this amazing? (probably the editors after seeing the first 3 chapters submitted for consideration)