The Coaching System - Chapter 103: The Ghost of Kaiserslautern

Yuki, a high school junior, dies heroically saving a stranger and is reincarnated in a fantasy world, where he discovers an extraordinary and unrivaled power.

All things must come to an end, but so long as possibility exists, even the cessation of all things will be greeted by reality anew, endlessly repeating but with the steps taken along the way varying infinitely...If you would like to support me or read up to 50 chapters ahead, search for me on Patreon at Eins_left_foot.

Once upon a time, an Alchemist Grandmaster from the World of Immortals accidentally took possession of a playboy, who hailed from a rich and powerful family, and became a student in the middle of his midterms.

By the means of a miraculous immortal technique, he blended in and mingled amongst the femme fatales’ group to dominate the city! The nature of this novel’s origin is shamelessness to the core; having no sense of shame is just a basic foundation, but if the most shameless isn’t set yet, then become it!

- Description from Novelupdates

Crossing to One Piece world, he became Roger’s younger brother.