According to the doujin, Akagi was apparently Shinonome's secretary ship before Suzuya. She is also attracted to Admiral Shinonome though she seems to have made way for Suzuya.

"... It's dreary, and a little unfair. But I'm your secretary ship for the day, who wouldn't use this to get a little closer to you?"

Oh, the aching sweetness of unrequited love.