Assassin's Creed : The Silver Animus and the World of Tomorrow

Desmond Miles, who sacrificed himself to save humanity, should've died. Yet he woke up on the year 2048...with amnesia. Then he was introduced to a game called Brain Burst by a woman who claimed to be his aunt. He plays the game, hoping to regain his lost memories. But instead, he is faced with the greater challenge of restoring balance to Accel World.