AU where the heroes fail to save Eri from Chisaki, but the The League of Villains does save her. Shigaraki is somehow attached to Eri because she reminds him of his little sister he once had. Eri sees in Shigaraki - not a hero, towards whom she now feels disappointment and resentment, but, maybe some kind of a savior. As a result, they find themselves on the same side of the barricades.