A phantom treasure sleeping somewhere in the world. Many explorers have chased it, yet not a single soul has ever reached it.

Three men pursue this treasure. A fearless treasure hunter, an archaeologist who deciphers ancient civilizations, and a grave robber whose motives and origins are shrouded in mystery.

One day, they encounter Guest, who holds the only clue leading to the treasure.

A map to the treasure. Mysteries hidden within ancient ruins. Numerous trials lying in wait.

Thus begins the journey for the treasure by Guest and the three adventurers.

[Clues to the Treasure] A single map depicting the ruins of an ancient civilization and a mysterious crest engraved upon it. And an old golden pendant set with a blue gemstone, worn by Guest. At first glance, they appear to be ordinary relics, but they are vital clues pointing the way to the legendary treasure, "Astra."

[Beyond the Map] A massive ancient ruin forgotten over long years. Surrounded by deep jungles and steep mountains, few even know of its existence. The first destination of the adventure leading to the place where Astra is said to sleep.

[About Guest] Guest travels with an old pendant found long ago. Unaware of the pendant's origin or the meaning of the engraved crest, Guest wears it simply as a "precious item."