MTL - There Will Always Be Protagonists With Delusions of Starting a Harem - Chapter 12 Overbearing brother-in-law falls in love with me

A story about a traveler who crossed into a parallel universe, relying on his Proficiency ability to continuously grind experience and become stronger.

When the cosmic tyrant Frieza detonated Planet Vegeta, home of the Saiyan race, a twist of fate sent a lone infant—placed in an escape pod by his mother—hurtling through the void toward an unknown destiny. The pod's trajectory led him to a desolate world: Titan, a planet ravaged by catastrophe and long stripped of life.Beneath the shadowed skies of this barren realm, the watchful eyes of Thanos, the self-appointed director of the universe's population balance, beheld an unexpected sight—a child, the sole survivor of Titan’s forgotten civilization... a child with a tail swaying behind him.“A survivor of Titan... From this day forth, you shall be my son.”

With the ability of the King of Silver, the first king in “K”, to be immortal and immortal, he crossed into the world of One Piece. Although he became a Pirate, he did not target One Piece.

His goal is to live freely on the sea, it’s that simple.

- Description from novelbuddy

For ten years, Ryn lived in quiet exile with his wife Mira, far from a world overrun by supervillains. But when the flames of chaos reignite, he’s forced to return to the battlefield, stronger and deadlier than ever.By his side is Mira, his unwavering partner—devoted, ruthless, and hiding a darkness Ryn can't see.Enemies rise, old ghosts return, and war looms on the horizon. Ryn seeks justice, while Mira seeks to protect him... even if it means drowning the world in blood.Let them come.