Once saved, he gives the Hero the side quest "No Sign of Life," in which the Hero must travel to a nearby bungalow and check on Sebastian's friend.
He then gives the Hero the side quest "The Dead Don't Eat Crackers", in which the Hero must search the nearby bungalows for food.
With his bungalow stocked full of food, Sebastian reveals to the Hero that he has been infected and does not have long to live. He explains to the Hero that he recently celebrated his birthday, but when his parents asked to visit, he blew them off. He then gives the Hero the side quest "Message of Love", in which the Hero must travel to Sebastian's office and send his parents an e-mail apologizing and saying his goodbyes. He will then give the Hero a blue Wakizashi as a reward.
Due to being infected, Sebastian later turns into a zombie.