"When the skies and the grounds were one, the Legends, through their Twelve Forces, nurtured the Tree of Life. An eye of Red Force created the evil which covered the heart of Tree of Life, and the heart slowly grew dry. To tend and embrace the heart of Tree of Life, the legends hereby divide the Tree in half, and hide each side. Hence, time is overturned and space turns askew. The Twelve Forces divide into two and create two suns that look alike into two worlds that seem alike. The Legends travel apart. The Legends shall now see the same sky but shall stand on different grounds; shall stand on the same ground but shall see different skies. The day the grounds be kept a single file before one sky, in two worlds that seem alike, the Legends will greet each other. The day the Red Force is purified, and the Twelve Forces reunite into one perfect root, a new world shall open up."
~EXO MAMA Intro

The Red Forces have risen again, and EXOPLANET's twelve member star Footbase team has been chosen to be the Legends, the Twelve Forces who are supposed to protect the Tree of Life from this evil. Can they succeed?