They became magical girls because it was their own choice. They wouldn't regret it... They have decided not to. Not running away from their own destiny, but facing it from the front. They would live as if they were so intense and beautiful that their lives would shine all over the world.
These Girls don't regret becoming Magical Girls, because it's something they chose... They have resolved to themselves not to flee from their fate. They face them head on and live so fiercely that they light the world in a brilliant blaze.