At the end, when baby Kiyoko is accidentally dropped from a rooftop; Hana runs down the side of the building and catches her. If anyone deserves to be a mother, it's her.
Don't forget that Hana and Kiyoko are saved by Hana's grabbing onto a building-sized poster — as a gust of wind blows at just the right amount to bring them safely to the ground. As if God is saying "Good job. Let me take care of the rest."