Manami is your typical schoolgirl, despite the odd machines her grandfather is always building. One day, though, an odd evil robot comes to attack Minami's school, and commits the ultimate offense of threatening her friends... and ruining her lunch. Now, she will stop at nothing to return order to the world in her grandpa's newest creation: the mecha Del Power X.

The mysterious three-faced insectoid being, Violenjiger dispatches the nine "Great Decepticon Generals" to acquire "Zone Energy", destroying the planet Feminia to obtain the world's store, and search for the powerful Zodiac.

Ultraman Cosmos is a calm and gentle alien of unknown origin who seeks to protect Earth. Unlike most Ultramen, Cosmos is a pacifist and prefers to resolve his disputes or disagreements by the way of peace.