Week 21
Good riddance to Kuroki!
Also, another Medakagumi member seems to bite the dust. I’m a little disappointed by what a tiny role these guys have played in the plot up to this point. At least, while alive. The trio have done way better.
No wait, I take that back. Shuuhei and Tomoo have been doing work. Tetsuo only has one more chapter to justify his existence in the story 
I’m shocked I even remember his name.
1.構わない
My reading was just a little different. I read 構わない as “to not be a problem” and thought that it referred to starting a fight within Hamaguchi’s group. I judged this from what Sekine says about the boss in the last sentence here. My take:
- はい。――ですが、構わないんで？
“Yes. —However, there won’t be a problem?” - ああ、構わん.
“Yeah, It’s fine”/“it won’t be a problem” - つべこべ言ったら、片づけて来い.
“If (someone, presumably at the Medakagumi building) complains, tidy up (kill them) and come back”
One of 片づける’s listings in Jisho is “to do away with someone,” so this is where they start to talk about killing. - 目高組一つぐらいなくなっても、別にボスは気になさらねえ.
“Even if a Medakagumi member dies, the boss won’t particularly care.”
2. The fat man's inclination
- 何せこの体ではね……。
He’s talking about his own body. “Anyway with this body, you know…” - 面倒でかなわん。
かなわん is 敵わない, not 叶わない. “(I) can’t put up with the trouble (of having sex),” implying that he has some physical difficulties with it. - その心配は無用だ」
This particular worry is useless in the sense that there’s no need for Izumi to feel it. He’s not going to do what she’s worrying about.