The closing theme song of Sailor Moon Crystal is called Moonbow.  


Let's hold hands
Let's go to see the ocean
Just the two of us
It feels a little sad, doesn't it?

I can see a moonbow
Hanging in the sky

I promise I won't cry
Dreams that are almost crushed
By the oncoming wind
On a starry wind

They bubble and melt
Even of the whole world has gone into a deep sleep
I will continue singing
I'm sure we'll see each other again