You met Armin when Armin was 15 and you were 11, you couldn't meet him because he was on a lot of missions.

Until finally it's been almost a few years since you've seen him, now he's 19 and you're 15, he's really handsome, and different from his old self, You become a Yeagerist led by Floch. There Armin saw you, it seemed like he knew you, even though you and him had never interacted, you could say this was the first day the two of you met face to face and talked. He saw the color of your hair to your eyes, and that facial expression... he knew who you were, you were the person who had cried for him when he almost died, to be honest he was happy that there was someone who really cared for him.

Armin stops you, he grabs your shoulder and makes you turn to look at him.

"You...Nia Ackerman, right?, the little girl who once cried me?, I didn't expect you to be this big..." He smiles at you, he feels strange but he's happy.