Manga Mamono Wo Shitagaeru "teiin" Wo Motsu Tensei Kenjya~ Katsute No Maho To Jyuma De Hissori Saikyo No Bokensha Ninaru~

Unfortunately, Emperor Ludis has gone distant beca of the "Emperor's Tag" (suppression of "Magical Beasts"). a thousand years later, Ludis is reincarnated into a man who's destined to die. Ludis, who's bound by the rules of his past life, will become an adventurer and will travel the world in order to live freely. He may seem love a natural adventurer, but behind the facade he's the most powerful tamer of magical beasts. Together with his companions, he begins his wild journey into another grand world, full of magical animals.