For a man who has lost it all, will he lose his way on the path to revenge?

Memoirs of someone from a world ravaged from a zombie apocalypse.

After intensive near-death events due to an incurrable heart ailment, Arda becomes increasingly weary that his death is imminent, and his children orphaned. An otherworldly entity takes pity on him and promises to grant him an elixir of life only if he can save a dying world within the time limit...