People in Tokyo, Practicing Water Breathing

Time travel to a scumbag in Tokyo. This scum actually helps evil spirits hunt humans? Evil ghost? Is that the evil ghost in the anime who needs to cut his neck with a special knife to die or is exposed to the sun and turns to dust? [Training simulation begins] [Congratulations on learning 'water breathing' during ten years of self-exploration] Feng Changxin was silent, feeling the breathing technique he had learned, looking at the evil ghost opposite, and glancing at the katana in his hand. There's nothing you can do about it, evil spirits, tremble! The world's only breathing swordsman appears!