I'd say Akira x Nanaka works but it is very light, and it is one of the more "inferred" ships if you are going to look for it at all... you get more little things like Akira admitting Nanaka controls her life by now, and Akira being very interested in being able to see Nanaka blushing in Umika's side story.
It is also the only pairing Nanaka gets besides Hazuki, and Nanaka x Hazuki is way more forced, relying on you reading a few scenes at face value without taking in account the context around those scenes.