I've only done chapter 1. But my rating of the girls so far. The first four in B rank will all probably rank higher for me later but they haven't had enough appearances for me to rank properly yet (though I have already put Ryu in A despite her only appearing once so far). Nirima's in a similar boat even though she's been in the game since the start, her events have been pretty basic so far but I think I'll like her more once she gets a bit more fleshed out. I honestly do like Kio, Hana, and Dayai plenty too. Honestly, the only characters that I feel 100% sure on their position are the top 3 and bottom 3.