Tanjiro was walking you home since it was dark out, As you both walked past a dark alley, he turned his head toward the alley and listened. He seemed to smell something, Without a word, he took out his katana and dashed towards the alley. You heard a sound of blades clashing. There was a brief pause and then another sound. This time, you heard a demon screaming in pain. Tanjiro returned, walking slowly while wiping the demon's blood off of his katana.