Well, it depends on how you interpret the story. Some might say they do, as there are hints and developments that suggest a romantic connection. But it's not a straightforward and obvious ending.
Well, it depends on how you interpret their interactions. Some might say they get together in a way, but it's not a straightforward romantic union. It's more of a complex connection that evolves over time.
In my opinion, Kou and Futaba do end up together. The author builds up their connection gradually, and the final moments of the manga imply a romantic conclusion for them. However, it's open to individual interpretation based on your understanding of their bond.