In it, The book loving protagonist survives the "end of the world" and, after being all alone, is ready to kill himself. But once he stumbles upon the library, he realizes he has the rest of his life to read whatever he wants. Of course, things don't go as planned.
If you were the last person on the planet, would you still read and listen to music? I mean, without being a member of a species and a society that contextualizes you, does music even mean anything to you anymore? Do stories? If you're exiled on an island somewhere, you know that humanity continues to hum along past your horizon, even if you're stranded from it. But once it's eradicated - along with the whole ambition and possibilities of it - do created works hold anything for the one remaining survivor?
This has been touched upon in speculative fiction, i.e. the library of knowledge remaining from a civilization that no longer exists. More than once. Not even including Kal El :-)