World-Ending Demon Emperor - Chapter 42 - 40 Sister-in-law

Crossing into the world of Naruto, and acquiring the One Piece system, with all the powers of the world of One Piece, swordsmanship, devil fruit, domineering.

-Do you think that your fire is very powerful? I have the burning fruit.

-Do you think that your thunder is very powerful? I have a thundering fruit.

-Do you think that your otter is very powerful? I have the frozen fruit.

-Did you said you want to die? Don’t worry, I also have a nickname: Death Doctor.

- Description from Novelupdates

The figure of the Armada seems to be still riding the wind and waves in the Atlantic Ocean, and the gold of South America still seems to flow in continuously. As Alfonso from the Bourbon family returns to the Royal Palace of Madrid where he was born, the story begins here…

- Description from novelbuddy

For non anime fans- Yandere is extremely possessive girlsIn an open world MMORPG game called Stellaris Fantasia Online, me and my partner we're rising to the top, killing other players, farming loots and so on....But, yes, this partner of mine won't let me play with others.... even with my friendswhy? because she's a Yandere....Its so irritable that I unfollowed her.... well that decision hurts me too, since she might turns out to be a hot onee-san (older woman)But as soon as I attend the class, my homeroom teacher is in bad mood...Why??Just read the title....

In the most cliched fashion, a giant truck-kun smashed into my World, killing everyone with it.

And in the next most cliched event, I was given a second chance in life by the gods to live another life in a world of swords, magic and dragons! It’s literally a dream come true!

Be a hero? Who has the time?! Conquer the world? Like hell I’ll do something so troublesome! Diving into dungeons, exploring ancient ruins and meeting all the weirdos of the world? Sign me right up!!

I’m only interested in travelling the world to find the most interesting materials I can use to write the best story I can! I’ll show you my creativity and dazzle this new world with the stories I’ll write!

I’ll fight with dragons, swim with krakens, wrestle giants, eat all the cakes and bed the beauties! Time to live this life however I want!

Eh?

A psycho is running around the world saying that they are the hero who will slay the demon lord? Why is there such a crazy person?

There’s someone out there threatening the world with nukes? How did they even find out how to make those?

Some crazy hobo is going into other people’s houses to smash pots to look for money? That guy really must be crazy.

What Do You Mean There Are Other Transmigrators In My Harem Fantasy?

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Notes:

Any R-rated scenes will be denoted by a '*' followed by an 'R' with the number of 'R's showing how much of it is R-rated. '*R' would be around 25%, '*RR' would be about 50% and '*RRR' would most likely be the entire chapter.