Red-Haired Shanks kills Luffy, but Akainu arrives to save him. He cuts off Shanks's left arm and takes his straw hat, then gives it to Luffy, placing great hopes in him. Luffy lives up to that trust and vows to become a Marine.
Akainu is Luffy's idol. Luffy aspires to become Fleet Admiral, establish the Straw Hat Marines, and wipe out evil pirates.
Because of Luffy, all his companions choose justice, too, and write their lives anew.
Evil fills the ocean, but justice is never absent. Luffy becomes a Marine, making the story far more logical.
This novel and its characters are entirely fictional. Any resemblance to real people or events is purely coincidental. Do not imitate.