Demon Slayer: Upper Moon Seven's Secret Identity

Wu Hen never planned to become a demon—especially not Upper Moon Seven under the ruthless Muzan's command. But when a mysterious system grants him the power to shift between demon and human forms, he sees his chance for the ultimate revenge. By day, he's a trusted ally of Tanjiro and a rising star in the Demon Slayer Corps, wielding the forbidden Dark Breathing technique. By night, he answers to the very demon lord he's sworn to destroy. One slip could expose everything. As Wu Hen walks this razor's edge between two worlds, he must complete his system's impossible mission: eliminate Muzan with…