My sister is Luna

He transmigrated, expecting a peaceful life in another world, but it turned out to be a treacherous world of kings. Cain decided to take up the mantle: "For my sister Luna, I will save the world! I will create a world where my sister can live happily!" On the night of the counter-attack ritual, he quelled the demon rebellion, investigated the Twelve Wonders, explored Hell… and finally faced the gods! —Achieving the legend of the Armored King. Empress Wu Zetian: "Bold Cain, how dare you call yourself Empress! Where do you place me?! Come to my palace tonight!" Luna, following in Cain's footsteps: "Brother, I will find you! You are mine!" Milady: "My curse rests on your shoulders." Mulan: "Cain and I are as close as family." ...