Wild Arms: Twilight Venom

Legendary hitman Juzo Ogami has never failed an assignment. But after a mission, he’s stung by a mysterious wasp and wakes up in the body of a 13-year-old boy! And to make things even weirder, he receives a bizarre new order: infiltrate a middle school. Now the once-feared assassin must balance the chaos of school life with his deadly work, all while searching for a way to regain his adult body!

This is a world of the skies, where many islands drift in the sky. A boy named Gran and a talking winged lizard named Vyrn lived in Zinkenstill, an island which yields mysteries. One day, they come across a girl named Lyria. Lyria had escaped from the Erste Empire, a military government that is trying to rule over this world using powerful military prowess. In order to escape from the Empire, Gran and Lyria head out into the vast skies, holding the letter Gran's father left behind - which said, "I will be waiting at Estalucia, Island of Stars".

Ryu and Ken travel the world to become better fighters and learn new techniques. During their journey, they find themselves caught up in a conspiracy of the mysterious Shadowlaw.

In ancient times, a great battle was waged between a master mage, Enno, and an evil demon goddess, Karuma. Enno didn't have the strength to defeat her alone and was forced to call upon Zenki, a powerful protector demon. After Karuma was defeated, Enno sealed Zenki away in a pillar located inside his temple. 1,200 years after this epic battle, Enno's descendant, Chiaki, unleashes her family's powers to summon Zenki.