Wish-fulfillment to near max. No tension because every character is OP. Overarching plotline is non-existent. At times, reads like an H-manga without going all the way.
However, character designs are quite good even with a stereotype of each member of the harem.
If you like isekai slave harems, this isn't the worst one. If you're looking for artwork and fanservice, this isn't a bad choice.

Another bad isekai of a supposedly intelligent guy that goes around collecting slaves and building a harem. Other things are mere add-ons to that basic premise and for an intelligent person the MC sure does a lot of stupid things. It's likewise laughable how to make the MC look intelligent the author doesn't actually have him be intelligent, he make all the other characters idiots, like his classmates, not one was able to see through the King's blatant lies.
So yeah, story is generic as it comes or rather almost nonexistent, it had started well with the MC going his own way and abandoning his classmates that bought into all the "be a hero" BS the King was selling them, unfortunately it doesn't seem to know what to do from there so off he goes to collect slaves, yay. Oh and forget about him laying a hand on them, there will be a 101 reasons and interruptions that will prevent that while showing tons of needless ecchi scenes. As someone once said, "another childish story written by a virgin Japanese guy". This are in the end the pueril desires of the mangaka in it's crudest form, not only have the MC (him by extension) be surrounded by girls but them being his possession, his slaves, kinda sick. Slavery is one of the most degrading and pervasive things in humanity, not a funny thing and even less something that people that love and trust each other would put the other trough, there is something wrong with in the mangaka's head.

Characters, story, dialogues, world, all quite bad, other than the very good art, very detailed, there is nothing particularly decent here. Dropped.
I can't believe I'll say this but even "Tate no yuusha no nariagari" is several times better and pretty much the same thing (added the revenge part).

... Last updated on September 15th, 2019, 8:46am

Seriously the market for beta male Japanese isekai protagonists is over saturated. Every single MC is the same two dimensional characters with no standout features. They can be OP or skilled in something but their personalities are that of a dead fish. Hot girls fawning over you? Somehow no libido. Some bad guy is being a douche to a helpless victim and you have the OP powers to stop it? Oh but me just Japanese office worker/student, me no want to stand out. Either that or "Hey can we settle this peacefully Bully/Slaver/Killer/Rapist-san? I don't like violence because that hurts my fragile pacifist soul."

Done with this bullshit.