The entire thing. Wouldn't be able to tell you exactly how they changed or shortened things to fit it in 8 episodes of ~40 minutes each though since that would require rereading the entire manga while comparing things, but the TV drama had the whole story.
For anyone curious, the live action series already aired and finished last week. Yes, it did air on TV (with all the incest and all) and was a fairly good adaptation.
I wonder if I should tell my sister we're actually married...?
Jokes aside dude's got guts to kiss his sister while his parents are home after just being punched by his dad for kissing his sister