Keigo and Katsuki are Siblings AU. Keigo was not a wanted child. Keigo never had a good life. His childhood were filled with disappointments until he gained a younger brother - Katsuki. Keigo didn't like Katsuki. Katsuki had everything Keigo didn't. But he learned that Katsuki loved him and Keigo swore to protect him. Yeah, until Keigo was dragged away to live another life. Keigo couldn't see Katsuki and Katsuki was fed with lies. Keigo failed much. He couldn't protect Katsuki. Not after everything. Maybe Katsuki coming to Yuuei was a horrible plan. If Keigo hadn't become a Hero, maybe Katsuki would have been much better off. Or The reconcile between two brothers who were promised to a different life, but with each falling deeper into the abyss. Crossposted on Ao3All Rights Reserved