21 parts Complete Book two of "A Long Long Time Ago"
"We're in the Endgame now."
ENDGAME SPOILERS (if you haven't watched Endgame yet, you're an uncultured swine)
The Avengers had just lost their first battle to Thanos, who had wiped half of the population, including half of the Avengers. They do whatever they can to get the population back but fails. 5 years later, The Avengers come up with another plan to get the population back, but they have to get the stones that Thanos "lost." As the plan goes along, Y/n discovers something about herself. She puts the pieces together and realizes that she's the key to defeating Thanos and the stones. But the ending is not going to be what she expected.