Demon Slayer: I Was Treated as a Ghost by the System

[Demon Slayer: Kimetsu no Yaiba] [System] [Fighting is cool] [Genius style] During a crusade mission, Yan Sheng and his team were completely wiped out, followed by the collapse of the country. Foreign enemies divided the family property, the tribesmen fled in all directions, and the country was completely wiped out. Everyone thought that the three brothers of Jiguo were dead. But no one knows—— The youngest brother, Shinichi Tsukuni, is still alive. As a time traveler who is familiar with the plot of "Demon Slayer", He should have stayed away from the Demon Slayer Squad and lived in troubled times. And when he was involved in the ghost incident, [You are cruel and bloodthirsty, devouring human flesh and blood, and your ghost power is +10] Shinichi Tsukuni looked at the barbecue in his hand and fell silent. [You hunt powerful enemies and successfully kill a string-level ghost, the ghost power value +200] He lowered his head, looked at the kid whom he stoned to death, and fell into deeper contemplation. ——The system regarded him as a ghost. From that moment on, everything went wrong. In a duel with someone, he can directly learn the opponent's breathing method; The breath of wind, the breath of fire, the breath of moon... As long as you survive, the system will determine—— "The evil ghost survives, and the rewards are settled." As he stood before the pillars: Ridicule, suspicion, and disdain ensued. But the next moment—— But they saw with their own eyes that within a few days, a young man Continuously master a variety of breathing techniques, even approaching the realm of pillars. And the system is still calculating the "ghost clan's merits" one by one. ——Obviously he is a human, but he is judged to be a ghost. ——Standing among ghost hunters, he looks like an alien. When facing the system, he only wanted to confirm one thing: "If the world treats me as a ghost—— Then I will use the "ghost" method to kill all the ghosts. "