Although it was an unusual job, the Ninja Cow still applied for it. The job was to protect the Sacred Iron from the underworld boss. The statue of the Sacred Iron could be made into a super weapon because inside of it was hidden a special gem. The underworld boss wanted to get the gem in order to rule both worlds (the underworld AND the top world). One day, the boss rallied his troops and headed to attack the Ninja Cow. The Ninja Cow fought all the troops until there was nothing left apart from one hiding under a bush.