Return To Earth 1-CW TRINITY-

"where are we?"
"A place called National city...."
"National city?but there is no such place called National city,unless..."
"We stuck at another earth..."said Barry with a confused look on his face

this is the story where Oliver Queen and Barry Allen stuck on supergirl earth
How will they return to their earth?
will they be able to work along with the D.E.O and supergirl?
is it possible to maintain a relationship with someone from another earth?

well lets follow their journeyXD