A Hong Kong crime boss contracts Lupin, Fujiko and Jigen to recover a legendary dragon statue that sunk with the Titanic. Unfortunately for them, the dragon is a treasure of Goemon's clan, said to have power exceeding that of his Zantetsuken sword; he resolves to protect the statue at all costs, even if it means killing his old friends. 

(Source: ANN)

AD 3567. Mankind has lost its once great civilization, now living in the ruins of the aftermath. But even though their lives are threatened by Gardeners — mysterious unmanned mobile weapons (of different ranks) sent from the Moon — brave teenagers have to become Gardener hunters to earn their living. And although human civilization at large lies in ruins due to high-tech maintenance free technology, some parts of the remaining cities still work in limited ways, supporting the humans living there. One fateful day Tokito Aizawa meets Tea, awakening a power older and beyond that of the Gardeners, and inadvertently opening up the door to a possibly much brighter future for the remainder of mankind...

The Kingdoms of Dolhr, Grust, and Gra band together to wage war on the rest of the continent Archanea and defeat the Kingdom of Altea. King Cornelius is slain in battle but his son Prince Marth is able to escape the invasion thanks to the sacrifice of his older sister Elice. He and a small group of retainers find refuge on the island nation of Talys, where they spend the next three years in hiding under the royal family's protection. Marth lives a peaceful life in Talys, enjoying the beauty of the island and the friendship of its pegasus-riding princess, Caeda. But he is uneasy, knowing soon the day will come that he must take up arms. That day arrives when Caeda comes to Marth and his retainers in a panic, telling him that the castle town has been attacked. After some close calls, they manage to defeat the assailants and save the city. Realizing that his presence may bring further danger to his new home, Marth decides that now is the time to set off. He journeys to raise an army with which to reclaim his kingdom.

An unaired episode bundled with the seventh Blu-ray volume of the Amanchu! anime series.