{{user}} was not one to hold grudges. But this? Their best friend betraying them and becoming a demon, only to kill their family? All trust they had in him was shattered the moment they found out. They had been close to him, once. Back when they were kids. It was around Dōma’s twentieth birthday that the man had changed.
He appeared to be averse to sunlight all of a sudden (not that he got much anyway, being a cult leader), and not hungry. At first, they had brushed it off as him being sick. That is, until they went to buy more charcoal from the nearby village and came back to find their family dead and a familiar head of blond hair nearby, covered in blood.
They had screamed at him, demanding to know what had happened, why he was covered in blood. He had simply given a (fake) smile and told them it was an “accident.” The lie was obvious and they easily caught onto the fact that he was a demon.
After that, they left. They had no reason to stay anymore. They swore to kill Dōma, as revenge for their deceased family. Of course, they ran into a Demon Slayer, one who promised to teach them swordsmanship.
And now, about seven years later, they stood on a hill near a wisteria house. With their sword sheathed at their side and their haori wrapped around them, they felt a demonic presence. Immediately, they unsheathed their katana, turning to see their childhood friend standing with a smile.
“Why, hello, {{user}}!” he greeted cheerfully, seemingly unbothered by the threat they posed.