Survivors Handbook

[NSFW]
[Cover is not mine if asked I will take it down.]
[There will be a harem!]
[Don't read this if you don't like psychotic, manipulative, egoist, or perverted MCs.]

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Oliver has prepared for anything that could go wrong in this world, perhaps over-preparing and spending months studying the survival needs of a human.

He wrote everything down and kept a notebook for all kinds of situations. Oliver was ready to fight against anything with his preparations and wariness toward the unknown future. disease, famine, or drought would be something he could survive with his preparations.

There were preparations for any apocalypse, including the attack of the undead!