Isekai Maou to Shoukan Shoujo no Dorei Majutsu

Should I start this manga? Do you like Echii and I'm not talking soft-core stuff, there are sections of this manga that could just be classified as hentai. If you can live with that, and the story getting slower and slower then yes you should pick it up if you like Isekai with a strong harem driven, OP MC.

-Moderate Spoilers- (If you don't want a quick plot overview skip down to the pros and cons)

The story hits it off with MC-kun being Summoned to another world by two adventurers who wished for a powerful familiar but in-fact had the spell reversed on them making them MC-kuns "slaves". We're only a the start and its already saucy!

From here MC-kun strives to be an adventurer and get favor in the land. Good the objective has been set, and on-top of that it's not a hard one. These come to fruition and the slightly harder and harder challengers come up to contest MC-kuns ownership over his "slaves".

After some time the kingdom is in need of assistance against other races and MC-kun is required to give assistance. From here on the story isn't bad, nor is it overly good, but if you like the easy on the eyes echii and OP MC-kun then you might just get a kick outta it

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Pros:
Slaves
Echii
Interesting start prospect
Nekos

Cons:
Too much Echii (For me to enjoy it, the "plot" needs just as much story impact as the actual plot does, if the "plot" is just a cover for a poorly written story then its not worth my time)
Slow story progression

Will I continue to read it?
No,though I don't have a lot to say about the overall manga itself, the story just ended up lacking that finesse that originally struck me when i read the first couple chapters, its originality went out the window and the excess "plot" without having enough actual plot just made it seem like poorly written hentai.

How NOT to Summon a Demon Lord, or as I like to call it, Harem King From Another World is your standard ecchi/harem isekai with an overpowered mc.

PLOT

One day the main character is suddenly summoned into a fantasy-type world as a slave to a pair of adventures. During the summoning process, something goes wrong and the roles of master and servant are reversed leaving the newly summoned protagonist with a catgirl loli and big tiddy elf as slaves. The world is extremely similar to a game the protagonist played in his world, hence when he is summoned not only does his appearance change, but he is also able to bring all of his items with him from within the game. (similar to overlord)

CHARACTERS

Honestly, nothing really stands out here. The characters are pretty funny and there's a lot of fanservice. Diablo, the mc, is a chicken on the inside but has to keep up the appearance of a real demon lord. While unoriginal, this led to some funny interchanges. The rest of the characters were just your average harem members, otherwise known as free fan service.

OVERALL

This show wasn't bad at all. It was pretty funny and full of ecchi. I wouldn't recommend this to people who tend to dislike the isekai/ecchi genre, but for those who do, you will definitely enjoy it.