The first executor selected by the government of the time to deal with the Dark Fallen was Riu Yi. She was ruthless and desireless, as if she was just a machine to perform tasks. As the initial sword, Yamaguchi Kunihiro is not her first sword; and the reason why Yiqi Yishen is so loyal to her seems to have a hidden meaning.
Intention: I just want to tell a story that may be regrettable but warm.