Surviving In The Apocalypse With An Undead Lover

Suddenly, in October 26 2020.
An unknown energy called 'Mana' descended into the world, changing everything, marking the start of chaos.
Due to this event, various animals in the world mutated turning into monsters, creating great chaos across the world.
Marking the era of Apocalypse.
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Alex Hector, a normal teenager must now survive in the Apocalypse.
Facing new adventures, battle, and meeting new people.
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Note: This is my first novel, so don't expect much.
PS: I'm not good at English, so expect some grammar mistakes.