After Tadashi's death, Hiro encounters an unusual visitor who claims to be able to grant any wish he desires. Hiro knows exactly what to wish for. But every wish comes with a price. Crossover with the Puella Magi Madoka Magica universe. No need to have seen it though.

Prequel to A Game of Thrones - Harrenhal, Stark children, Knight of the Laughing Tree, the Mad King, Lyanna's abduction, Catelyn Tully, and Ashara Dayne. Intended ending is the end of Robert's Rebellion if I'm patient enough.