With his friend's gone thanks to the Sirens, Barbatos joins a faction called the Azur Lane, alongside his friends including his long lost sister, Barbatos sets out to avenge his friends and stop the Sirens once and for all
Barbatos and the ship girls take a break from fighting to get their equipment fixed, While he wanders around the base Barbatos saw Unicorn, Prince of Wales, and Illustrious passing by, then Unicorn greets him
Unicorn: wait Onii-chan
Barbatos: Huh?
Unicorn went up to him and hugged him
Barbatos: Umm what's going on here
Illustrious: You didn't know, you are her biological brother Commander
Barbatos: You know what guys I don't feel comfortable with being called commander, I know I'm the commander of the Azur Lane but no need to call me that, It's boring you can call me whatever you want I don't mind at all.
Prince of Wales: Okay then Barbatos
Illustrious: Maybe you and Unicorn should catch up together
Unicorn: That is a good idea let's hangout with Javelin-Chan and Laffey-Chan
Barbatos: wait you mean...
Before he could finish his sentence Unicorn drags her brother with her, As Illustrious giggled at them, suddenly more memories started coming back to Barbatos, he realized that after he and his friends are created, they were given Mobile Androids/Sister Frames who were designated to be their younger siblings, Barbatos with Unicorn, Zero with Laffey, Quanta with Javelin, and Freedom with Ayanami. Then the humans decided to separate all of them from each other, where they will be taken care of by their respective adoptive parents.
Barbatos (in his mind): Man this kid has a strong grip
Unicorn: Hey guys
Barbatos looks at Unicorn's friends
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Javelin: Oh hi Unicorn, Hi command...
Barbatos (in his mind): why do they look familiar,
Unicorn: guys what's wrong
Javelin: We had a strange feeling when we saw the commander
Laffey: Same, Laffey feels like she is reminded by someone.
