This is kind of sad yet heart warming if it's implying what I think it is.

It is sad. As Akatsuki, Ikazuchi, and Inazuma were sunk and the only survivor of this Destroyer ship sisters is Hibiki only which handed down to USSR.

Seems like they were used for modernizing 'Verniy', thus, she kept the souls of her sisters in her heart. Those 4 light are the modernization animation in the game.

Bloodylistic said:

Seems like they were used for modernizing 'Verniy', thus, she kept the souls of her sisters in her heart. Those 4 light are the modernization animation in the game.

If that is true, then that explain whyshe is smiling while crying