Is it possible to play through the game story with a friend online?
Unfortunately there is no online coop for Shadow Of Mordor. The entire game is a single player experience, but there are online features.
When your friend is playing the game and they get killed by a captain it will create a vandeta mission. These missions allow you to avenge the death of your friend by killing the same enemy that killed them.
Not quite coop, but it’s the best we have. Maybe the next game!