Ginta has often dreamed of traveling to a fairy-tale land, but when a gate to the World of MAR appears before him, he realizes it's the start of a spectacular adventure.

After aiding Dorothy on her ÄRM hunt, Ginta's forfeited the ownership of the dormant legendary ÄRM Babbo, a sentient weapon that is just as vexing as it is fabled. Ginta's and Babbo's bickering eventually leads to their newly founded company crumbling, landing Babbo in the hands of two ÄRM thief con men, Moku and Chapu. However their identity is quickly exposed, and after Ginta forcibly reclaims Babbo, the two reconcile.

Ginta's traveling leads him to the house of Jack, a father-orphaned farmer of Ginta's age living with his hospitable mom. They befriend each other after the two vagrants help him outfight the Rogelu brothers, two werewolves terrorising Jack's farming, and Jack decides to accompany Ginta on his way to find a way back to Earth.

The trio arrives at Pezu, a small town where Jack does his trading. As their efforts to search out the occult clown Dimension ÄRM turn fruitless, more trouble's to come: Ginta's again robbed of Babbo by the Stanley bandit. When the boy fights to recover his ÄRM, one unlikely hand of help extends from Alviss, a mysterious yet hostile boy introducing himself as the one who summoned Ginta to MÄR-Heaven using the "Monban Piero" clown ÄRM.

A mysterious boy named Alviss suddenly appears before Ginta and company. He claims to be the very person who summoned Ginta to the World of MAR. What is his true identity? Who and what are the "Chess Pieces" he speaks of?

Ginta and the others enter the frozen castle where they face the "Chess Pieces" for the first time. How will Ginta handle Ian, the Rook class Chess Piece! And, who is this girl named Snow who is trapped inside the ice?

Ginta learns that Chess Pieces are much stronger than expected! Just when all hope seems lost, help appears from an unexpected source.

Alan explains the World of MAR's current situation, and of the history of war between Cross Guard and Chess Pieces. Ginta can barely contain his excitement. What waits ahead for Ginta's solid resolve? Meanwhile, Phantom, the commander of the Chess Pieces, makes a big move...

It's time for training as Ginta, Jack and Snow are sent to another dimension with the help of Alan's Dimension ARM "Training Gate". What arduous training tasks await Ginta and the others? And what is the purpose of the Magic Stones Alan hands them?

While Ginta and the others train in another dimension, "Chess Pieces" finally begin their advance to take over the World of MAR! Is there any hope for the World of MAR or will it be checkmated by Chess Pieces' immense force?

Ian, one of the Chess Pieces, attacks Alan who cannot fight back while his Dimension ARM is activated! With Six months of intense training complete, Ginta returns ready to battle the Chess Pieces! Will Ginta's training help him beat Ian?

Now with Dorothy on their side, there lacks two more members to incorporate team MÄR which, according to Snow, will defend MÄR-Heaven in the Cross Guard's stead. On their way to Hild continent, Ginta & co. are ambushed by Luberia, MÄR-Heaven's most prestigious thief guild.

Nanashi's ARM sends Ginta and the others to Vestry, the village completely destroyed by Chess Pieces. Enraged, they chase after Orco and Girom, two Chess Pieces, into a cave with an underground lake. Can "Team MAR", stand up to the these two villainous Chess Pieces?

The battle between Ginta and Girom has begun! The Chess Piece Girom, a member of the Bishop Class, underestimates Ginta, but soon learns from his mistake when Babbo turns into the most amazing weapon yet!

A filler episode. Ginta's team runs into John Peach, a loudmouthed boy claiming himself to be the hero that shall save MÄR-Heaven from under the Chess Pieces claws. He steals (thinking he's earned it) gold from some thieves who happens to have a strong spider ÄRM (who he later gets by accident).

In Vestry and throughout the world of MÄR-Heaven, the Chess’ announcement of the War Game rings like death knell, gathering all its adversaries to Reginrave castle, stage of the preliminary round. However, aside from Ginta's MÄR team and Alviss of Cross Guard, none of the salvaged fighters gets out of it alive.

1st Round, 1st battle, Reginrave castle stage, Alviss wins his first victory against a Rook named Leno Rodokin. His Cross Guard past as a child is brought into light, including his fatal first meeting with Phantom, which has resulted him his cursed blemish, the Zombie Tattoo.

1st Round, 2nd battle, Reginrave castle stage, Jack against Leno's Rook sister Pano Rodokin. The battle ends a comical loss on Jack's part.

1st Round,3rd battle, Reginrave castle stage, Ginta vs. Garon Rodokin, the Bishop father of the previous Rook siblings. The utilization of his invincible Guardian Gargoyle brings about Garon's ultimate defeat.

As the meaning of resemblance between Ginta and the Cross Guard former captain Danna dawns on him, Gaira summons him and Jack back to the Training Gate. Meanwhile, Ian approaches Phantom and requests the same, Ginta's true capacity has precipitated the time he carries out his vow: to kill Ginta and Gido's punishment executor.

2nd Round, 1st battle, desert stage, Snow of MÄR and Fuugi of Chess Pieces duel. Snow's giant Snowman "Yuki-chan" slams quickly crush Fugi and his geographically advantageous Wind Arm.

2nd Round, 2nd battle, desert stage, Nanashi vs. Loco. The Rook's mastery of Darkness ÄRMs corners Nanashi (in its physical literally) into a paralytic position. Though he manages to beat his way out of it without killing the girl, the excruciating pain from her voodoo tools takes it toll and he loses.

2nd Round, 3rd battle, desert stage, Dorothy against Maira. Ignorant of his opponent's magic kingdom nationality and her inhumane notoriety, the Bishop challenges Dorothy with his amoeba Guardian Vacua, only to be devoured altogether by her Guardian dog Toto.

On the night before the 3rd Battle, Ginta runs into "Tom", who with the Chess Pieces hot at his heels, beseeches the boy's help. However the hunter (who turns out to be Peta) outwits both, and kills "Tom" right in front of Ginta. Leaving the boy with his wrath provoked, Phantom returns from his framed "death" with his head high; Ginta's bound to give all out against the Chess in the future, given they've murdered a 'friend' he's promised protection.

3rd Round, 1st battle, volcano stage, Alan wakes from his slumber inside Edward to combat the Rook Alibaba, who deliberately spars with Cross Guard's 2nd-in-command to ascend to Knight class. With little effort, he obliterates the presumptuous tyro's Guardian Genie's Lamp, showing him his place, and casually tosses him into the volcano for his disrespect.

3rd Round, 2nd battle, volcano stage, Jack vs. Pano rematch. Jack's continuous trainings come to fruition; his hallucinatory toadstools triumph over her primal Weapon ÄRM, and inadvertently earn him her affection in the process.