Since it seems to be following the anime I think its probably Kongou
From the way the bubble's spoken, it doesn't feel like it's Kongou. She normally ends her sentences with DESU or NE; or has some form of gratuitous English.
Zui...kaku...?...call you "Kaga-nee"?How did they end up happily ever after like that?smooch♡Double or nothing....call me anything you like.Call...Don't ask me...Can I......that's why...