A disturbance is detected in the world of the living and when sent to investigate Hitsugaya is once again dragged into the wizarding world and finds himself enlisted to fight a war that is not his own. This time the Dementors are the least of his problems

Hitsugaya is sent to watch over Hogwarts to protect the living's souls from the Dementors while they search for Sirius Black and to learn about the soul eating creatures. But things don't go according to plan.