Uchuu Kaizoku Captain Herlock: Arcadia-gou no Nazo

The Arcadia turns toward Earth without anyone at its helm, behaving as though it can hear the ocarina that young Mayu is playing far below. Harlock watches while his bewildered crew tries to understand a ship that seems to have a will of its own.

A signal then draws them into the Sargasso Sea, where fighter jets and ancient warships rise against them. Amid the ambush, the mystery of the Arcadia becomes inseparable from their chances of surviving it.