With worry for Eren Yeager gripping her heart, Mikasa Ackerman begins to remember. She remembers her conversations with Armin Arlert, her concern for her friends, and most painfully, the time she had almost lost everything. As fear takes control, she begins to experience an alternate version of her past—some things can be changed, but are there events so inescapable that she can't even prevent them in her dreams?