Y/n was new to Japan. Inherited with the power of the ancient violet flame, she's been trying to become stronger so she could defeat her birth father, Lucifer, The King of the Underworld. In Japan, she runs into a monster, and quickly demolishes it. Little did she know, there was a spectator. Saitama was 3 centimeters from punching it, and behind him? Genos. A beautiful cyborg that fell for her the moment he saw her. How will their stories be told?