Kaibutsu-kun: Demon no Ken

The Great King of Monster Land falls under a deadly curse cast by the Demon King. The only way to save him is to reach a temple in Demon Land and pull the Demon Sword from a stone statue of the king before the curse finishes its work.

Kaibutsu-kun sets out with Dracula, Wolfman, and Frankenstein, but the Demon King watches their every move through a magical water mirror. Assassins and illusions repeatedly block their path, forcing Kaibutsu-kun and his companions to fight through Demon Land if they hope to reach the temple and save his father.