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Appearing suddenly in the One Piece world on Conomi Island, ruled by the tyrannical Fishman Arlong, Mike from Earth receives a Proficiency System and novice Haki abilities. Forced into hiding, he begins a brutal training regime, leveraging the system to rapidly level up his Physique and Haki attributes by punching cave walls and meditating, driven by the need to survive.
His growing Observation Haki allows him to gather intel on Arlong Park and Nami’s plight under Arlong, fostering empathy. He forms a tentative alliance with Nami’s sister, Nojiko. An accidental, powerful discharge of Conqueror’s Haki grants him levels but highlights its uncontrollable danger. Reaching reliable Armament Haki Lv.2 becomes his key goal.
Driven by urgency after Nojiko’s intel and fearing Arlong’s retaliation against villagers, Mike successfully assassinates officers Chew and Kuroobi in separate, brutal encounters, gaining vital combat experience but suffering injuries. His path collides directly with Arlong, leading to a devastating, prolonged battle that destroys the surrounding forest. Just as Luffy and the newly arrived Straw Hats (who rescue Nami from Arlong Park) become aware of the fight, Mike, severely injured but exploiting an opening, manages to kill Arlong in a gruesome final blow. Victorious but exhausted, Mike collapses, only to see Captain Nezumi and Marines arriving on the scene.