Transformed into Esdeath, the Ghost King Was so Happy to See Me

Becoming a woman + not getting married + system + training Transformed into Esdeath, awakened the strongest queen development system, and in order to go to the world of Red Eyes to reverse the tragedy, Zhou Qinglian could only agree to the system and go to other worlds to collect energy to upgrade the system. At the first stop, she came to the world of Demon Slayer: Kimetsu no Yaiba, and got a newbie gift pack at the beginning, the three-piece set of the Demon King Muzan's happiness: natural markings, the sword, and the transparent world. Every time Muzan saw me, I was so happy that I burst into tears~