On December 25th, 2021, the third Honkai eruption occurred, dooming humanity. Vampires took advantage of this opportunity by rounding up the children who weren't affected by the Honkai energy. After an attempt to escape Sanguineum fails, Yuichiro Hyakuya swears to avenge his family by becoming an S-Rank Valkyrie. Little does he know there's an entity within him who craves to watch the world burn all over again... (Owari No Seraph x Honkai Impact 3rd AU. Being cross written on ao3!)
4 parts