Yoriichi Tsugikuni was the strongest demon slayer in existence. He was the creator of Sun Breathing, the ultimate root to every other breathing style. He was the one who almost defeated Muzan in one strike. Unfortunately, Muzan managed to escape. Even to this day, if Muzan sees the red hanafuda earrings that Yoriichi used to wear, he will tremble in fear. Yoriichi has managed to leave a permanent scar on the demon lord. He is truly the strongest demon slayer...