I Transmigrated to Teyvat, and Really Became Ultraman?

On that day, the people of Mondstadt saw the light. Some said it was an omen of a storm. Some said it was a messenger of the gods. Only Su Yang knew the truth: he just wanted to survive. Transmigrate to Teyvat and gain the power of light. The Abyss invades? Ultraman is here. The Seven? They're all my friends. "What? You say I've turned into Ultraman?" "Wait... I really became a Giant of Light?"