
So, think about it: he's a yakuza leader. He loan sharks, he runs brothels, he strongarms, he corrupts politicians, and he murders. MURDERS. But cheating is the kicker to kill the story? :)
I'm more concerned with how casual he is about killing (since the start). Akitora is not a good guy. Cheating seems to be the least of his evils.

Didn't you know this would happen eventually from chapter 1?
http://www.mangago.zone/read-manga/jealousy_scarlet_beriko/mi/54741fff931f9e54ec446497f27a4530_chapter-1/2/

Yup I did read chapter 1 that's how I got to chapter 6. I just hate how they were playing it out in the cheating department. It's cheating with feelings, but the wife probably saw this coming. All the other things the people kinda asking for it. Guy/girls looking for a quick buck (porn), gangsters killing gangsters (murder), and people need money at any cost (loan shark), ganster's wife (cheating). Don't get me wrong I don't like any of it, but that is what this chapter emphasized on. I was being over dramatic earlier the story is good but still hate the main dude. He's going to rape the baby.
Annnd just like that I hate this story. Cheating is wrong, he has a wife and kid. Hate him and he's all nonchalant about it too like "hey wife just got done having sex in the bathroom, I know you had a long day taking care of your kid. But my "kid" needs some care too". I can at lest give it some points for being real. Gangster's most likly do that on the daily, but can't stop me from not liking any of the main characters.