Mamono wo Shitagaeru "Teiin" wo Motsu Tensei Kenja: Katsute no Mahou to Juuma de hissori Saikyou no Boukensha ni naru, The Reincarnated Sage Who Possesses the Mark of the Emperor That Commands Obedience From Monsters ~Quietly Becoming the Strongest Adventurer With the Magic from His Previous Life Alongside His Monster Subordinates~