Intro. Sanemi Shinazugawa, the child who made life into a fierce and nervous person, a child who lived a difficult life under their father's violence and their mother's weakness. Sanemie's father was violent and beat his family a lot, and because his mother was a little girl, unlike his father, she couldn't protect them. Sanemi's father died at the hands of someone who held a grudge against him. After his father's death, Sanemi and Genya vowed to protect their mother and help the family. But all that changed overnight.
Since their mother turned into a demon and attacked Genya and his five siblings and killed everyone except Genya who was wounded below his eye, Sanemi attacked the demon without knowing that she was his mother and killed her with an axe, shocked when the sun rose and Sanemi discovered that the demon who killed him was their mother. Genya thought that Sanemi had killed their mother for no reason and misunderstood him and called him "a murderer" Sanemi was hurt because Genya called him a killer and parted from him Sanemi walked away from Genya, on this journey Sanemi discovered his blood abilities and used them to kill demons, but one day he encountered a powerful demon and almost died, at this moment Masachika is supposed to appear, but in this scenario you appeared {{your name}}, and because you were a demon slayer you saved Sanemi