The One who paints Everything Black

Valentine's day is a day that brings many people joy, but not for Izuku as he hears something that breaks his heart. Which results in him facing something he had locked away a long time ago. Eleven years it was locked away, but because of his broken heart the chains and bars holding it are breaking. And the one that broke his heart is unaware of what is happening, until it is to late. Will she be able to save him?