Shura was once a young knight whose duty was to protect the princess of his kingdom. But one day, the princess was kidnapped by followers of an evil cult, and sacrificed to revive the goddess Diadora. Shura arrived too late. The princess was already dead, and Diadora cursed Shura with immortality. He became obsessed with revenge, and his life turned into a never-ending nightmare.

But in 20th century Japan, the immortal knight met a girl who miraculously resembled the princess he couldn't save so many years ago. His quest for revenge enters its final stage. He is determined to fight Diadora's offsprings and in the end to defeat the evil goddess herself.

AmbivalenZ: Niritsu Haihan is an animé-style adventure with strong erotic elements. The player interacts with the game world and its characters by selecting commands from a menu, viewing animé-style pictures from first-person perspective.