By the middle of the 21st century Earth has become so polluted that mankind began to look for other planets to dwell on. An expedition is sent to a colony known as “3rd Earth”. When Lein, the leader of the group, awakens from cryogenic sleep, he sees how robots slaughter his crew. Lein discovers a medieval-like civilization on the planet, and must work together with the locals to fight robots and magicians belonging to the Cain race.
Cain in the 3rd Earth is a Korean-made role-playing game in Japanese style. The player navigates a party of characters through overhead environments. There is no world map, and hostile areas connect villages, towns, and dungeons. Enemies are visible during exploration and can be avoided. Combat follows a simple turn-based template, with regular attacks, magic, and item usage. Leveling up is fully automatized.