Bastard!! (1992)

It is 500 years in the future. The world has been destroyed by an unspeakable evil, and has grown back in the old feudal form of kingdoms. It is roamed by monsters. The kingdom of Meta Rikana is under attack by the evil wizard Abigail. The mages have put up a seal, but it is only a matter of time until the seal gives. The 15 year old daughter of the greatest priest, Yoko, has been given a spell by her father to summon forth the greatest warrior of their kingdom, from an innocent (her best friend, a 15 year old boy), by a kiss. This warrior is Dark Schneider, a warrior that tried to conquer the world 15 years ago, but was imprisoned inside the body of the boy. Now, he is both the boy and Dark Schneider, and protects Meta Rikana, and his friend/love, Yoko, while exploring his past in encounters with old enemy Ninja Master Gara, and former love, half-elf Arshes Nei.