For the first comment, allow me to say something wholesome and not toxic.
Misaki has a point, even though Kazuma's attitude is good and understandable. When your S.O. is so nice and caring and attentive to you, it's hard to state your own wants, fearing to come off as rude and selfish. A bit of selfishness is ok, sometimes good, but the nicer someone so close to you is, the harder it is to embrace your wants.
Also I like how Kazuma's got a nice relationship with all these girls, even though we know he's only having the one girlfriend. This is one of those situations where I kinda wish for a harem. Speaking of, I'm curious to what everyone else, particularly the Japanese, thinks about harems, in anime and IRL.
And ah yes, the classic "We got booze on this onsen trip, so now we get lightweight anime girls" trope. This manga is so generic, but I love it regardless.
Lastly, WHADDYA MEAN A SLING BIKINI WAS ALL THAT FIT YOU, YOU MIGHT'VE AS WELL GONE IN NAKED BY THAT POINT