One Piece: I'm Destined to Be the Son-in-Law King! - Chapter 38: Efficiency! Efficiency! And More Efficiency!

The little handsome son-in-law passed through a world as waste material and the husband of a wealthy family. But because of his lacking aptitude, the wealthy family had driven him out. So he worked hard and found a more powerful family’s thighs to hold onto. Soon enough, he became the strongest son-in-law and husband in history.

In this world, it was impossible to practice martial arts. It was futile so he might as well take advantage of his wife’s thighs and maintain a comfortable and leisure lifestyle.

He’ll train his wife to become the strongest and best person in the world.

“Whoever dares to provoke me, let my wife kill you!”

- Description from Novelupdates

Getting the [Boosted Gear] is expected for Issei. What if he gained it a month early and another one as well? Let the Games Begin... IsseiXHarem (if it wasn't, it wouldn't be DXD). Now has a TVTropes page! Getting the [Boosted Gear] is expected for Issei. What if he gained it a month early and another one as well? Let the Games Begin... IsseiXHarem (if it wasn't, it wouldn't be DXD). Now has a TVTropes page!

Suddenly appearing in a different world, it looks like I got caught up in a Hero Summoning. And of course, I’m not the Hero, but it’s another guy……and while being very cautious and scared of the cliche of the cliche-like development, I was thrown into the maelstrom of war……or not.

The Demon Lord? It was defeated a thousand years ago. Hero? He’s just the main actor in a festival. Nobles? They’re kindly taking care of us. The Demon Race? They have good relationships with Humans. Wars? It’s already 800 years since the last one. Monsters? The Guild and Order of Knight are taking care of them. Return to Earth? It is eventually No-Risk.

What I’m planning after being caught up into this? I’m gonna enjoy the life in a different world as much as I want to, go on a cultural exchange and sightseeing, and after experiencing the festival that is only held once every ten years……I shall go home safely.

The other world was――at Peace.

A kind world where the three races, the Spirit World’s Magical Races, the Celestial World’s Divine Races, the Mortal World’s Human Races, they are kind neighbors to each other, with everyone living a peaceful and fulfilling life.

But although I wished to peacefully spend a year before my return, for some reason, the heavyweights of this world keeps gathering around me, and……

Teresa is a timid human whose life has been a series of unfortunate events—until she meets Lucian Blackwood, a very rich and handsome man who awakens a deep, unexplainable connection within her. But Lucian, an alpha werewolf with a haunting past, is repelled by Teresa’s perceived weakness, blaming weakness for the tragedy that shaped his life. Unable to accept her as his mate, he rejects and humiliates her, leaving Teresa shattered.Just as she’s picking up the pieces, Adrian Daegon, an ancient vampire with his own dark allure, steps into her life, determined to win her heart. Now, Lucian is torn with regret, desperate to reclaim the woman he cast aside. But to do so, he must face a powerful vampire and confront his own fears—while somehow convincing Teresa to forgive his betrayal and reignite their lost bond. Can love and redemption overcome the scars of rejection, or has Lucian's cruel mistake cost him his mate forever?Torn between two powerful forces, Teresa must decide where her true destiny lies—in the fierce grip of the wolf who scorned her or the dark embrace of the vampire who vows to adore her.