Fate/Zero (2011)

S2E7 The Assassin Returns

With her life slipping away, Irisviel rests under Kiritsugu's watchful care, her comfort his sole priority. Yet the Holy Grail War waits for no one, and duty drags him away to strike down his next opponent. While he's gone, an ambush shatters his sanctuary, claiming someone irreplaceable. He returns to find his world in ashes, grief carving a hollow where hope once burned.