Demon Slayer: Adopted Son of the Purgatory Family

Sun Chen, a charming and beautiful young man, woke up and found himself in a different world. This world has samurai, ghosts, and the so-called breathing method - the world of Demon Slayer: Kimetsu no Yaiba. His parents in this world were killed by evil spirits, and he unintentionally became the adopted son of the Purgatory family. He activated the system and embarked on the road of killing ghosts step by step. He unintentionally completed the system's mission and obtained the remaining scroll of Breath of the Sun! By analyzing the remaining scrolls of the Breath of the Sun, and with the support of the system's props, he created his own breathing method. The breathing method that surpassed the Breath of the Sun - Breath of the Dragon, gradually drove the ghost to a dead end and became a generational hero. (Some parts are different from the original work. I added my own ideas and world view. If you don't like it, please don't criticize me. Thank you)