Thanos snapped his fingers and half of the Universe was turned to dust, lost to the winds of tragedy.
For the Avengers, those winds are more of a tornado, unrelenting and unforgiving.
They lost family, friends, loved ones, and the chance to live a life worth living. In their eyes, the damage is beyond repair, but this is especially true to Steve Rogers.
He and Bucky Barnes had only just begun their relationship as lovers, stepping past the threshold of friendship and trading platonic feelings for the infinite flames of their love for each other. Steve didn't handle Bucky's loss well, and he still isn't - a month after their day of reckoning.
He's depressed, anxious, suicidal, and pushing himself through existence in search of a way to bring his soulmate home.
Hope lies in the hands of an hero from another world, a hero that followed Steve's example of self-sacrifice and resilience.
The reason why?
He's like her - from another world.
And, putting it simply, this story isn't about defeating Thanos. It's about self-discovery, love, and hope. (Read: Steve will have his sweetheart back home in his arms before he knows it).
When the love of Tony's life dies while deployed overseas, Steve - his spouse's best friend - is there to help him pick up the pieces. And while Tony lets himself take comfort in Steve's friendship and shared grief, he refuses to entertain the thought of opening his heart to anyone else - until the day he wakes up and realizes he's quite possibly falling in love with his dead husband's best friend.
Meanwhile Steve, though devastated by Bucky's loss, is determined to take care of Tony for Bucky's sake - it was practically his dying wish, after all. But as time passes and hearts begin to heal, Steve soon finds his feelings for Tony are less-than-platonic - and that Tony might even feel the same way.
But can he really start a relationship with his dead best friend's husband?
Working through guilt and grief and the ghost that is Bucky's memory, Steve and Tony cautiously decide to cultivate this thing between them. And just as everything starts falling into place and they build a life for themselves, Tony gets a call that once again sends it crashing down around them.