'Lust system': Rise of the Harem lord - Chapter 42: Storm Thorned Gate

A boy awakens alone in the Fairy Tail world, lost and uncertain. As he ventures through this magical realm, he unravels the secrets of his mysterious new identity, unlocks hidden powers, and carves out his destiny in a land brimming with wonder, danger, and limitless adventure.“Check out my other work, Reincarnated as Ash: A Pokémon Tale.”

“Do females fly??”“What?!!! I've never seen one.” Parrick said with a frown.“Then why....” he said nonchalantly pointing to the sky where a female was descending at a super sonic speed with a loud scream on the top of her lungs.Parrick gaped at the sky in disbelief. The female clearly had no wings...so how come she was up there! Also...there were no flying beastmen settlements from where the female came from!!!“Ahhhhhhhhhh!!!!!!!” the female screamed falling from such a high altitude and her scream died down the next minute.“My Lord ...we didn't save her!!!!!” Parrick gaped in utter shock and disbelief.“Her scream surely attracted a number of other males. They'll go rescue her...and you too can go if you badly want to.”“Huh!!!!!” Parrick was dumbfounded.“Look!” he said and indeed a group of flying beastmen and other land beastmen were sprinting to the direction the female had fall in.Sydney is swept away by a tornado and is thrown into a different space. She's confused as to why she came to this weird world but she accepts her fate. The people here are half human half beasts and despite being an independent woman back on earth, here she needs a male to survive but not just one.... multiple males.-One male is younger than her-The other is literally a walking legend-Another is venomous, even from mere skin contact.-The other is a hard specimen to understand-Her last male is a walking disaster!

In the end-French era, after countless calamities, the era of cultivation is coming to an end. The last combination of air transportation and evolution has evolved into the treasure board, which was obtained by the last practitioner in the end-French era, which opened up a legend of wandering heavens.

- Description from Uukanshu

The story is about a a hitman, Who dies because of his own recklessness and transmigrates into a game he used to play after his retirement as a hitman.I'm not gonna spoil any further, but i might answer few of your questions.Is MC overpowered?Nope, he'll become strong over time and all battle he'll fight will be because of his effort and techniques.Is there magic and adventure?Yes! It have both magic like normal isekai with adventure and fighting with monsters and many other things. There are other important things like “Essence Stone” But let's talk about it in the chapters.There will be harem?Not really, He will be in contact with many beautiful female and males but one waifu but i haven't decided yet.All i can say is, give it a try, I'll try my best to make it worth your time.