One Piece: Seaside System - Chapter 1: Marine Based -

Leon Walker, the world-weary genius of modern world, is killed in a freak accident — the notorious Truck-Kun makes an appearance. Death is only the start. He finds himself reborn in a new world, Galvia, reincarnated into the strong but failing body of Duke Leon Moonwalker, one of the only three Grand Dukes of the Moonstone Kingdom, a minor but strategically powerful kingdom within Galvia. As Leon attempts to understand his new world, a strange voice resonates in his head. “Supreme Spouse System Activated.”.

Growing up in an orphanage and surrounded by poverty, Leo never expected anything good from life. Everyone around him had abandoned him, forcing him to survive as a thief. Yet, fate had other plans.Caught by mysterious figures during a daring theft, Leo is forced into accepting a perilous mission. Transported to a strange, magical world, he confronts terrifying myths he had never believed were real.Suddenly thrust into a brutal, nightmarish battle, Leo hears a feminine voice, filled with authority and danger:“Are you worthy to be my Master?”In that moment, his life changes irrevocably—transformed in ways he'd never dreamed.And the cruellest twist?He's the only human participant in this deadly game. With just one champion at his side, Leo must navigate and survive the merciless battles ahead, relying on his skills to fight, endure, and above all… to steal.But remember, this is just F—

A god of a different world had abruptly appeared in my classroom and semi-forcibly summoned the entire class to his world.ーーーーexcept for me, Kamiya Yato.

There’s an ancient saying in Great Ruins, ‘Don’t go outside when it’s dark.’