I'm an Ultraman, and You Want Me to Be the Dark Emperor?

Yun Yang transmigrated to the Ultraman universe and became a rogue Ultraman. Just as he was thinking of joining the Land of Light, punching the Golden One, crushing Alien Empera, and marrying Carmeara, he activated the Darkening System. But the System was defective. It only gave him the appearance of a villain, not the soul of one. To keep growing stronger, he had to do things befitting a villain. As it happened, Mephilas captured him and took him to the Dark Universe, so he went along and joined Alien Empera's ranks. From then on, Yun Yang slowly rose from a minor general to a dark general, a chancellor, and more... When Alien Empera went into seclusion to recover from serious injuries and entrusted him with the throne, Yun Yang was completely dumbfounded. I'm an Ultraman! And you're asking me to become the Dark Universe's Great Emperor?