The Phantom Warrior

In a world where Gaea prevails, one man and one man alone is the only hope for the survival of humanity. After Gaea defeats the seven and Nico, she sends them to different time periods. She fails to send one of them though. The only one who could stop her. He has to go back through time, chasing the other seven, to bring them home. Only one problem though, he has to kill them first