Naruto System in One Piece - Chapter 523

In short, MC inadvertently created a world, but as the creator of the world, he did not know the world at all. He should have lived here like a fish in the sea with some plug-ins that MCs always have. But now he is even stumped by the bugs in the instant world. Luckily, in this world he has found his shadow guard, or his lover? So the daily adventure is getting not so boring…

- Description from Novelupdates

Ethan wakes up expecting to see the walls of a hospital room—only to find a system message blinking in front of him:[Ding! You have killed a green worm][Ding! Green worm has been added to your summoning list]

The eldest son of the assassin aristocrat Tuatha Dé.

The skill, experience, knowledge of the previous life, magic, all of which grows his power as an assassin.

Excellent assassins pass through. He was usually admired as the ideal lord, and behind it wielded a blade as an assassin aristocrat.

Liang Ning had just bid farewell to her eldest and second eldest brothers who died on the battlefield, never expecting that when she was preparing to fulfill a marriage contract with an orphan she saved six years ago, she would be burned alive by him!Upon waking, she became Miss Fu of the Fu Family, and her murderer had already risen to a high position, surrounded by beautiful wives and concubines, becoming a trusted minister before the emperor...No fear!Miss Liang of the Liang Family changes lanes, still the decisive and ruthless Rashamon!But why does that brat, who used to play around with her nephew and knew nothing about respecting elders, keep pestering her?