Demon Slayer: the Swordsman Without Emotions

Kaedehara Cheru was reincarnated in the Meiji era. On his ninth birthday, his family was destroyed by an evil demon, and he finally learned that he was in the world of Demon Slayer: Kimetsu no Yaiba. He was lucky enough to survive, but was wrapped up in the nightmare of the tragic death of his loved ones. His emotions gradually became cold, and there was only a familiar but vague nursery rhyme left in his mind. He had never heard of the Demon Slayer Corps and did not understand the method of killing ghosts. He only relied on deep-seated hatred to explore the way to kill ghosts alone in the darkness. Later, he joined the Demon Slayer Corps and became Shuizhu - the most silent and indifferent but also the sharpest blade in the team. My only wish in this life is to kill all the evil ghosts in the world. (Single female protagonist + no system + homemade water breathing + don't know the plot) [Note: Breathing of Water is different from the original work]