ETERNAL RETURN is the story of Lexi, a secret agent of the Company.

Eternal Life agent Lexi is chosen to take charge of a special mission in the simulation world created by the company and carries out her first mission, but her fate begins to fluctuate greatly from then on.

During her first mission, Lexi meets Eternal Life Company's biggest enemy and powerful being, Dummy Code Olivia. After that, she senses the dark secret of her company and begins secretly digging up information while carrying out missions to find out.

As the Eternal Company's suspicions of Lexi grow, she eventually meets Philip, the head of the company's renegade agents, and learns the truth about the company....

The main progression of the game is to control the main character, Lexi, by using various guns to defeat enemies or solve light puzzles to complete missions. You can also upgrade Lexi's skills to make her stronger.