Dorei Tensei – Sono Dorei Saikyou no Moto Ouji ni Tsuki –

Ars, the prince of the Kingdom of Karitz, who was called the strongest wizard, died at a young age. But on the verge of death, he uses reincarnation magic. Reincarnated as Wals Sai, a s*ave with the best body! Wals, who became the escort of a princess in a small country, became a matchless s*ave who used his best body and magic to crush all enemies!