Who Does Kayo Marry

Does Satoru get with Airi?

Airi does stand up for Satoru several times, but they never really are seen engaing in any actions that would quite sum up to a ‘romance’, more of a relationship built using mutual trust and help.

Why did Kayo not wait for Satoru?

Hiromi x Kayo made sense in a way in terms of the storyline and all that. They were both targets for the murders and their baby is proof that Satoru changed the future…and it is what made him regain his memories pre-coma. Satoru acted towards Kayo with more heroic intent over romance.