This track has apparently been edited a bit to extend its length.
They’re saying the following:
Once upon a time, in the distant future—
Girls made a deal with beings that came from another planet.
For having any single wish be granted
magical powers would be bestowed
and they would fight frightening monsters.
Girls from all kinds of worlds had their wishes granted to them
and countless girls fought with monsters.
Before long, everyone came to use up all their power.
Among the girls that possessed magic
A secret rumor spreads.
When they disappear from this world,
a magical god will come.
and guide all magical girls to a wonderful land.
A wonderful land where there is nothing to hate or be sad about.