God I love her so much. I hope they don't turn her into a villain just for Jin to pummel. She could be so much more, since it looks like her desire for vengeance doesn't go past simply offing Kazuya, and she just dislikes having Jun interfere. One interesting detail from the character stories is that, both, and only Reina and Jun's character stories are a daydream/dream.
(It seems that) She's not quite ready to take (drink) it black.
People who have followed this series may remember that little KC Kaga isn't the first shipgirl who Taisa has had asking Bismarck for black coffee only to find out how bitter it is. That would be Amagi-chan in post #5556416 (later revisited in post #6271145, which also incorporates post #5079833).
