Naruto System in One Piece - Chapter 5: A Rank Ninjutsu

With a marriage contract forcefully done, he married her, and all she could do was comply, and resent him deeply for that and for all the following misunderstandings they faced.
However, it was already too late when she understood she actually loved him.

Ruan Yōu became a brainless cannon fodder in the Mary Sue entertainment novel, with fair skin, a beautiful face, and long legs. She was criticized by fans as “trying to climb up” after looking at the top male lead too much, and the female lead took the opportunity to suppress her, causing her career to plummet.

Ruan Yōu accepted her fate and decided to retire from the industry to study finance and live a laid-back life as a salted fish.

However, her billionaire parents and CEO brother came knocking on her door, their eyes filled with guilt.

Ruan Yōu: ?!

Retiring forty years early and living a life reclining on the couch as a rich woman has just arrived!

**

Fu Jiazhan had known since he was a child that the little princess who had been betrothed to him had gone missing.

Mrs. Ruan spent her days in tears, holding his hand and choking out, “If Yōuyōu hadn’t gone missing, you and she would be about the same age, and you could have grown up together and taken care of her.”

Fu Jiazhan remembered those words, and when Yōuyōu returned to the wealthy family, he prepared to take care of her as her fiancé. But his future mother-in-law found three rivals for him.

- Description from Novelupdates

Naofumi Iwatani, an uncharismatic Otaku who spends his days on games and manga, suddenly finds himself summoned to a parallel universe! He discovers he is one of four heroes equipped with legendary weapons and tasked with saving the world from its prophesied destruction.

As the Shield Hero, the weakest of the heroes, all is not as it seems. Naofumi is soon alone, penniless, and betrayed. With no one to turn to, and nowhere to run, he is left with only his shield. Now, Naofumi must rise to become the legendary Shield Hero and save the world!

A world-famous hacker and daughter of the most powerful criminal family who ruled the international underworld for many generations is killed when their organization is annihilated in a single night.