No! My Girlfriend Turned into Ultraman?

It turns out there really is Ultraman in the world. One hundred years into the universe, alien invaders have descended on the earth, and an apocalyptic crisis is imminent. "It doesn't matter, I will take action." Higher civilization came to help, "You two humans take these rings. As long as you put them on and collide with each other, you can summon us to the earth..." "Hey!! We need two people!" "Ah... You... Said... What?" Fang Xiaona, who merged with herself, turned into a giant superman on the spot.