The bikinis aren't the problem, the comments from some male characters threatening to rape the female characters, or saying they want a "taste" of them is. Saying all of the female characters was a huge stretch I admit, but I've completed the series and noticed these situations came up far more...
There's no denying the plot armor for Usagi and Arisu. Every single time one of them is in trouble, some character magically sacrifices themselves to save them...
Wait what? The girl with the long hair and the gangster looking guy were literally always together 24/7. When did J have time to tell the girl to kill the gangster guy each round?
Annoys me so much how sexualized all (edit: some) of the female characters's in this manga are. This is why I usually don't read shounen or seinen, but the plot line is so good. Guess l'll just have to roll my eyes and keep going.
I don't think this chapter was done well. This plot point should have been saved for later in the series (maybe in vol 7 or 8) for more emotional impact. There was barely any development with Chouta and Kurabe's characters...