Died a Slave, Reborn a Noble: Becoming the Strongest with a Daughter Who's Older Than Me

Overview

The arena—a place where slaves are forced to fight to death. Lewis was one such slave who lost his life in a match. But when he opened his eyes again, he found himself in the garden of a luxurious mansion. Much to his surprise, Lewis reincarnated as the sixth son of a nobleman. One day, more than ten years after his reincarnation, Lewis meets a fellow slave and friend from his previous life, Sharon. But while Lewis knew Sharon as child, she now appears in front of him as a lady older than Lewis himself. (Source: Manga UP!)

Source: AniList