Yankee JK Kuzuhana-Chan Self Insert

I tried looking for fanfics of this manga and couldn't find any. I thought it was a damn shame, cause this is one deserving of a proper re-write.

Seriously, reading Kuzuhana-Chan is probably the biggest waste of time I've ever had. It's like Rent A Girlfriend, except the MC isn't a massive simp/loser, and the female protagonists are "ok".

Anyways, I'm gonna give this one a big makeover. Just a Self Insert taking over the MC's life, but adding some extra stuff in there, too. Spoilers, the manga has a lot of fighting in it since the main girl's family does karate or whatever, so I'm gonna add Baki Hanna stuff, too.