How do you repay someone who saved your life when all you can do is die?

It's been three days since Subaru and Emilia separated on the worst possible terms. Subaru has fled to Crusch's mansion, letting Rem tend to him while his heart festers. Gloomy and distraught, Subaru ignores his instructions to stay put and returns to Roswaal's manor. But what he finds when he arrives brings the spiral of death and despair even closer...