Hua Cheng's second-in-command's feed

That's it! Akane x Kana it is.
They have a good dynamic too from whatever little conversation they had. Aqua isn't good enough for any of them and even if he gets together with one of them by the end I doubt he will ever be mentally stable for a good relationship. Even though almost everyone in this manga is twisted in one way or another hopefully Akane and Kana have a good ending.