@migh As per an interview for the novel of this series: "Though it is a sequel, Igarashi stated that the novel can be read as a standalone story."
So no, you do not have to read/watch the original
It's not that the story is "generic" per se... It's just that you can see every twist coming, and there's an abundance of stereotypes. Also, it feels like there's no intrigue whatsoever, everything is just "go get 'em tiger".
If the shop is doing well, why the fuck are you letting him leave early? Doesn't that mean there are lots of customers? If you're letting him leave, doesn't that mean the shop is doing poorly?
"All the half-demons won't go extinct if he makes children with us!"
There's one fundamental flaw with that logic... All the half-demons WILL go extinct because the children will all only be a quarter demon...
I read more of it, and holy shit his actions are so creepy. First the kiss the first time they meet, then shit like asking for her phone number and shit, it just doesn't sit right.