EPCOM: Expermental Prototype City of Mars. ECHO has been drafted against her will to be a participant in a government-funded experiment entitled "EPCOM" or the "Experimental Prototype City of Mars". She must train for a year, and then set off for the Red Planet, holding on to only her memories of home...RIVER has been in love with Echo ever since he met her, before her parents died. So, when he finds out about her drafting for EPCOM, he creates a deception against his employer and voluntarily accompanies Echo to Mars, determined to protect her...STORM's father died five years ago, leaving him with the responsibility to care for his mother and younger brother, Rain. So when Rain is drafted for the new experiment "EPCOM", he naturally assumes it's his responsibility to go, too, to make sure he's all right. He's always been determined hard-set and filled with inner strength, but when he's partnered with Echo in a Family Unit, new traits begin to shine through.