The premise of Mondai no Aru Restaurant is that a bunch of women and one okama were treated like dirt by a bunch of chauvinistic guys. Episode 1 is a set up episode where all the ladies gather and we learn their connection to the main character Tanaka played by Maki Yoko. At the end, Maki Yoko invites them all to open a new restaurant right opposite her former employers'.
As a revenge story, Mondai no Aru Restaurant doesn't work for me because there are too many characters. The ones who really deserve revenge are Maki Yoko and her former classmate Satsuki. The show is Maki Yoko assembling a team to avenge Satsuki who has gone back to her hometown but only Maki Yoko and Usuda Asami have a direct connection with Satsuki/ Everyone else is just baggage who are along for the ride. Of course, its pretty obvious all the characters will have some special skill that they can bring to the restaurant like the boss's daughter who can replicate the taste of any dish.
In terms of humour, there is nothing really funny except Usada Asami's character laughing at the dirty inferences every time the okama says something. And yes, Maki Yoko does display a lot more facial expressions as the positive, forward looking Tanaka.
If Mondai no Aru Restaurant were written by anyone else, I would say its a 'do not watch' but I'm willing to give it one or two more episodes to see where Sakamoto Yuji is going. Judging from the episode 2 preview, it looks like its going to be such a conventional show.
I think Sakamoto Yuji should have started of with a few central characters and slowly brought everyone else in one by one instead of throwing a crowd of characters at us and expecting us to care about everyone just because a two of them went through workplace abuse. Hold of watching this but the prospects of this being good very low.