//It's been 13 years after the incident//
The hero is still in deep depression.
Living in a wooden log house in the middle of a forest was just the right spot for depression.
Behind his house was Rosalia's grave, from which grown a tree.
His been living his life carefully and peaceful
while the world is resisting the titans.
forming an group of resistances all over the world.
One day there was a girl running away from a titan, but fortunate enough she ran into the former hero.
He killed it
Then the girl collapsed
He took the girl into his log house