Villain: I Must NTR All The Hidden Bosses! - Chapter 12: Awakening Ceremony.

“A modern online novel writer who had been struggling finds themselves transported into the world of One Piece, becoming a 10-year-old child.After a series of events, Ryuen arrives at Cocoyasi Village. The protagonist possesses the Tori Tori no Mi (Bird-Bird Fruit), Mythical Zoan type, Phoenix form.After undergoing a rebirth (Nirvana), the protagonist's transformation no longer involves turning their hands into wings, and the fruit's power becomes even stronger!From the moment they reach Cocoyasi Village, the protagonist and Nami embark on an adventure, traveling from island to island, indulging in food, drink, and fun. Along the way, they also help the poor by taking from the rich, because, after all, Bellmere’s family is still...”

Yan Wushi had walked a path full of blood and corpses.

He did not believe in the good nature of humanity. Even more so, he did not believe that there could be someone with great kindness and sense of justice, who would be so considerate of others without asking anything in return.

One day, Shen Qiao, who was the sect leader of Mount Xuandu, the number one Daoist sect under the heavens, was challenged to a duel but somehow fell off the cliff.

Yan Wushi happened to pass by down there.

Seeing Shen Qiao who was seriously injured to the point of dying, he suddenly came up with a perfect idea…

After thousands of autumns, who could stay eternal?

- Description from Novelupdates

Mark is a genius military weapon designer who was kidnapped by a mafia gang after refusing to work for them.
They forced him to design unique weapons for five years, until one day he successfully escaped only to get shot by his trusted comrades.
*Ding! You awakened a weapon system.
When he opened his eyes, he was in a different body and in a different world.
"You want to kill a wild boar without being detected? Forget about bow and arrow. Here, I present you this sniper rifle."
"You want to kill a horde of goblins from the sky? Forget about those flying carpets and brooms. Here, I present you the fighter jet."
"You want to kill a dragon? Forget about taking the help of the S-class adventure team. Here, I present you a nuclear bomb."
Join Mark Spencer/ Lu Zhen as he brings the whole world to its knees with the help of his weapon system.
***
Note: Author isn't born in an English-speaking nation and has no editor either. So, please be understanding if there are any grammatical errors.
**************
You can also support the Author through Patreon

https://www.patreon.com/snowstar

The Honoured One... A title bestowed upon the one who's pleasure and displeasure matter above all else within the bounds of Heaven and Earth.That is who I have become. Satoru Gojo - The Six Eyes may have claimed this title for himself, declared it to all of Creation and went unchallenged for it for years, till the awakening of the man I have been transmigrated as.I intend to honour that title.Power is meant to be used - to change one's life with.And change it I shall.----------------------------(Author note: This guy will be a lot like Sukuna in personality, but not a carbon copy - he will have his own views and thoughts that will contradict canon Sukuna, cause this guy is a transmigrated soul from our world who was thrown into the Invincible world with all of Sukuna's powers.Also, he was geniunely Sukuna in his past life.Romance: Sukuna X Yandere EveSukuna is in the body of Megumi (Shadows yet to be tamed)Read the auxiliary chapter for Sukuna's power level compared to this world, because I am taking some vague statements about Sukuna in JJK canon, to make him strong enough to not just be crushed in an instant in a world with Viltrumites.Hope to see you guys soon,Bye!)