The story is a bit bland to be compared with her other works - so many monologue and weak plot - but still, I love Usui Iroha so much that I don't care!
What exactly does Jooin see in this guy? He's hot, but you're gonna be sorry to like someone for that since his personality is fucking shit. Move along dude, not worth it.
Everyone else should just run away from the household. The three siblings and the mother, even the brother's wife...
Or just murder that one man.
What you wanna isn't clear)?!