Uma Musume Cinderella Gray final arc name is revealed: "Cinderella Gray Arc".

Revealed at the end of chapter 198.

Risen from the ashes, after many losses and the Cinderella magic (prime) worn off, Kitahara helped and encouraged Oguri to race Arima Kinen the final race of the Grand Prix. This is the story of "The Legend of Cinderella Gray ".

Man.... kinda sad that it'll end, but I'll read it till the end and enjoying the ride until then.