Phantom F. Harlock II, a Germanic descendant of the Harlock lineage, hails from Heiligenstadt. His ancestral homeland, known for its idyllic, rolling hills, is symbolically called "Arcadia," representing an eternal paradise central to his family's identity. His heritage includes notable ancestors like Phantom F. Harlock I, an early 20th-century aerial explorer whose autobiography shapes later generations. During World War II, Harlock II flies missions as a Luftwaffe fighter pilot in a Messerschmitt Bf 109. He participates in Axis operations but privately views the conflict as wasteful and ideologically detached from Nazi causes. His sense of duty feels like "paying rent," a metaphor for fulfilling outdated feudal obligations despite their anachronism in the modern era. This perspective highlights his conflicted loyalty to a command structure he no longer respects. A defining hereditary feature is his Heidelberg dueling scar, passed through generations. A pivotal moment comes during Germany's collapse when Harlock II meets Toshiro Oyama, a Japanese engineer involved in technical exchanges. Both share disillusionment with the war and dreams of peaceful technological advancement, like space exploration. Harlock II aids Oyama's defection to neutral Switzerland, smuggling him inside his aircraft's fuselage during an Allied assault. Mid-flight, Oyama suffers injuries while manually repairing severed control cables, allowing Harlock II to crash-land at the Swiss border. Cementing their bond, Harlock II gifts Oyama his prized Revi C-12D gunsight, declaring, "To a true man who I can believe in, to a true friend, I can give up my eye or even my heart." He then returns across the border to face the consequences of his desertion, urging Oyama to protect their legacy. Oyama pledges eternal friendship between their bloodlines. Harlock II's ultimate fate after re-entering German territory is undetermined, though implied confrontation with Allied forces or a military tribunal is likely. This act solidifies the Harlock-Oyama alliance, which resurfaces millennia later when their descendants, Captain Harlock and Tochiro Oyama, renew the pact during an alien occupation of Earth. The Revi C-12D gunsight endures as a functional relic aboard the starship Arcadia, symbolizing the oath's permanence. In the manga *Arcadia of My Youth*, Harlock II is depicted with an eyepatch following combat injuries, a detail absent from the film adaptation. The manga also extends the bloodline narrative, introducing Harlock II's daughter, Selene, and Oyama's son, further emphasizing intergenerational connections.