well I Am Legend got me thinking about a scenario wherein one has safely escaped to the safety of the countryside but routinely returns by day to scavenge through the remains of the nearby suburb, has many run-in's with zombies. the house in the countryside is a cross between a swiss family robinson treehouse and a maximum security prison. he survives long enough to meet a few others in the suburb who have also survived. one of these survivors is a teen girl whose little brother was bit earlier and ran away. the little brother is physically fully zombie but somehow his conscience wasn't fully blunted so he is still partially human, misses his sister, and watches over her from a distance. When his sister leaves along with a group of survivors with this stranger for the safety of the country side, he warily follows them out of the city, catching the guard of another zombie curious to if he's following a food source. he unknowingly leads this zombie to the hideout, and in his attempt to kill him, the zombie sounds off a zombie scream, and zounds of zombies descend on the fort, big battle, guns, bombs, and blood. He manages to find his sister through it all, severly wounded, and escapes with her off to the hillside where he watches her die, but it is a touching reunion. so yea, everyone dies in my story except for the zombies.
yea i know, its basically I am legend lol, but a different context, and more people lol. I am not a writer so I won't even attempt to write that out. but it would be interesting.
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It is not up to you to finish the task, nor are you free to desist from trying.