It is the third main installment in the Arc the Lad series and the first to not be developed by G-Craft, as the company was absorbed into Square after the release of Front Mission 2.

They make their way to Society Village, a town dedicated to restoring the world, and then to Gislem, a notoriously poor and dangerous city.

Learning that a secret Academy base is hidden in an old airship, the group makes their way inside, only to find it crawling with enemy robots.

They quickly learn of an uproar in the Hunter's Guild and investigate: someone has stolen a water controlling scroll from the nearby Amaidar Temple.

After making a promise that he'll help in any way he can, Leshalt send the team back, only to bump into his grumpy brother, Velhart, who was the best swordsman in Parute and the second best warrior, only behind Gruga of Brakia.

The chairman of the committee is than Gruga himself, after taking advice from Leshalkt to keep the statue in the Rochefort's manor and had Alec's party to guard it.

Not long after the incident, a job came from Leshalt in order to ask Alec to safeguard the Aura stone on the statue and keep it in the safe beneath the item society building.

After Alec and his party leave the house, the Professor (leader of the academy), whose name later revealed to be Ludwig, and Sharon enter Leshalt's retreat.

Seeing how Velhart used to say that he won't participate without Gruga in the line makes Alec and his friend curious about the sudden change of heart.

They set to double the aura stone Velhart brought, and the process was halted by Leshalt, which causes him to be killed by Seville of the Academy.

Alec and his crew follows her through the White Bone Forest and Midoro Swamp to the main building of the Academy located north of Felator.

As they battle their way to the top of the building where the Professor, Sharon and Seville is, they are halted by the Fear Crimson, a fusion of a dragon and machine.

Seville refers that it was their crown creation and was perfected due to the help by a cardist they captured in Forestamore, which is none other than Theo's mother herself.

Upon seeing the desecrated town beneath the vaporizing lake, Alec's memory recall the past where the moment he was saved by a hunter in the fire.

After passing several riddles and tricks made by Gogen, they meet the old man himself and by their surprise, hearing him said that the Dark One can't be re-sealed, as the ark was destroyed by Andel and the lineage of Bravery and Goddess (respectively Arc and Kukuru) has expire.

The clerk tells the team a story in which the undefeated Matheus was cheated by a fellow fighter to take the Great Mystic Sword for himself.

After they succeeded in calming the guardian of the temple with the help of Lieza, her monsters and Poco, they head into the depth of the earth to search for the relic.

With the guidance of the seedling, they reach the Eternal Tree's root only to find it was badly decomposed and was eaten by Rootybus, a centipede-like monster that has an extremely strong regenerative technique.

The seed grows into a giant tree in a matter of seconds and bear fruits similar to the shape of the seedling monster.

Alec's team reach Jiharta by hovercraft and head straight to the Amaidar Temple to consult Iga concerning the matter.

Feeling unconfident of herself, Marsia decided to ask Sania (from Arc the Lad II) in Paysus city to replace her in learning Giga Plasma.

After beating all the elemental wizards, Marsia receive the Giga Plasma as her new collection of spells, and use it to destroy the Ice Wall.

In an attempt to cure his amnesia, Marsia uses her Land Ax spell to cause a shock to his head, which restores his memory.

When they reach the heart of the mountain, they found the Eternal flame on top of a mini volcano with unstable reaction that could cause it to erupt and spew hot magma any time.

When they arrive at the item society, it appears that the mysterious object they found on Forestamore has been fixed and given a propeller and a handle so it could carry at least one person.

Meanwhile, as Elnan of the item society works on something to carry the flame, Alec's teams go on a search of a missing material needed to build the gun for hardening lava.

This makes Gudan wonders about the action and he presume that the second of the Great Disaster might happen if they didn't get the calm nut, so he give the information for free.

After leaving his body and enter the Crystal Chamber, he was greeted by Arc and Kukuru, telling him that they had been watching his journey since he got his hunter's crest.

A joint effort by Sharon, a redeeming Lugwig and Elc pushes back the Dark One from escaping, leaving the remaining group to fight.

Each member of the group goes off to resume their lives: Anriette (if you take on a series of jobs related to her) returns home and now enjoys being more independent.