Hametsu no Mars is a Japanese romantic adventure game developed by Idea Factory's IF Mate brand. It was released for Playstation 2 on May 26, 2005. An OVA by King Records was released on July 6, 2005.

In 2016 a manned probe send from the Earth to invistigate Mars explodes in the Earth atmosphere and fragments which contain a dna sample of what is thought as a trace to possible Mars inhabitants fells on Japan.

That causes mutations all over Japan. People who are infected by that "virus" are called the Iseki-jin (relic persons). The AAST is founded, obtaining the cooperation of structure Doctor Hiroshi Hyuga they develop a suit, "Mars", as a trump card against the relic persons.

The carrier of the suit obtains super powers but only a few people, who are dna compatible with the suit are suited to wear it. Takeru, the son of the doctor was the first person who was able to wear it.

When the fragment which fell to Earth is being transported to a laboratory in the USA for an analyze the trasnport is being attacked by the relic persons, now Takeru has to fight and defend it for a final solution in this incident.