I really keep getting the feeling that Itsuki is a female...or is a male that is into other males. They are drawn quite feminine (which men can also look feminine) like that one panel of the side profile really gave me those vibes.
If they are actually male and are into guys I wonder how they know Rui (or do they know Rui from before working there?). Then again it could just be Itsuki knows of Rui because of Kyousuke talking about her and somehow knows that this is the Rui he talks about.
Anyways, seems there is progress happening with our couple here. Rui admitted without him around she feels lonely. I know she is cold and doesn't show any emotions while Kyousuke is always showing them, but it seems she is starting to express herself even more than before because of him. But really, having her say she was concerned he wasn't going to return after leaving was cute for her. The ship is making slow but steady progress. I am here for it.