Transmigrated Demon Slayer: I'm the Righteous One

Su Wujie, a fifth-rank patrol officer of the Demon Slayer Bureau, despises the absurd notion that demons deserve equality. With formidable power and an iron-fisted approach, he partners with the new recruit Lin Xiaoyu, who suffers from multiple personalities. Together, they solve major cases including the ghost haunting an old mansion and the eternal night club of the Vanzhuo Blood Clan, while strategically allying with the Blood Clan's Eileen to disrupt their internal strife. Later, they infiltrate the Demon Slayer Academy, now occupied by the Heart-Eroding Demon of the East Sea. Su single-handedly defeats the rebellious director Chen Tian, and they jointly slay a King-level Heart-Eroding Demon to complete an S-rank mission.