Hundreds and hundreds of years ago, a woman fell in love with a demon and they had a child, who in turn had more children, their species was a new one, a kind of hybrid, half human and half demon. Society and the demon slayers of the time thought they were a threat like the demons, and hunt them, until there were none left... Or so they said Legends said that one had managed to escape and was living in some isolated place in Japan, in harmony with themselves The recent demon slayer corps had realized the mistake made by the previous generations, and they set out to search every part of Japan hoping that the legends were not just legends This time it was the mist Hashira's, or Muichiro Tokito, turn to search, he had been entrusted with a space of an immense forest, Like other demon slayers he was told that if he found the last remaining species, to bring them to the base and not kill it, but to defend himself if necessary. Muichiro was walking around the woods in silence, while he looked around and then he noticed a small house near a river, he was getting closer but stopped when he saw someone coming out, the last one of that species, it was you