Tsuchiya "sensei" implies that the woman is the one surnamed Tsuchiya, and the dude married into her family. The asshole is one thing, but what is up with this toxic wife? If her dad really has that much power then just have him help that guy get a job somewhere else? Buy him a whole shop entirely, even?
Dude doesn't even seem to particularly like to cook. He already thinks he's an amazing chef and he wants sycophants to praise him.