The Archangel rendezvouses with the Lunar Fleet and Kira and his friends have a choice to make about whether or not they are going to stay with the Archangel or if they are going back to Orb.
Flay decides to enlist and after that so do Sai, Miriallia, Tolle, and Kuzzey. Then they have to go find Kira to tell him that he can make the choice to stay or go.
But of course he has to stay because they are staying. That’s how this whole situation got started. And really we wouldn’t have a story if they all traipsed back to Orb to join their families.
And the little girl gives Kira a flower as a thank you present. Makes my heart burst.