Abel, the resurrected Sun-God, has come to take her sister Athena with him and rule the world together. He plans to destroy humanity in the form of terrible natural disasters. Athena chooses freely to go with Abel. Seiya and the other bronze knights can`t believe she has turned her back on them. Abel has his own group of warriors as well as some of the formerly deceased golden knights fighting on his side. The bronze knights will have to fight their way through them to find Athena and save her as well as the Earth. Source: theTVDB.com (modified)