In the Apocalypse, I Rely on My Immortality to Defeat Monsters and Become a Boss

During an adventure trip, two childhood friends were bitten by an unknown creature infected with a virus. They were then captured by a mysterious laboratory for human experimentation, and gained the power to explode the sky as a blessing in disguise. After the two reunited, they embarked on an adventure journey to fight against the evil laboratory and save the world.