Genki es un niño normal al que le vuelve loco el videojuego Monster Battle. Después de ganar un torneo de Monster Battle, Genki recibe como premio una copia física del nuevo videojuego que se encuentra en desarrollo. Cuando introduce el disco en la consola, se produce un extraño fenómeno y Genki al fin cumple su sueño, quedar atrapado en el mundo del videojuego.

Del disco del videojuego de Genki ha sido invocado un pequeño monstruo rosa llamado Mochi, el cual se une al grupo formado por el propio Genki, Suezo y Holly. Holly y Suezo están viajando por el mundo buscando a un monstruo legendario llamado Fénix, el único monstruo capaz de derrotar a Moo. El grupo decide pasarse por la ciudad más cercana con el fin de prepararse para la siguiente etapa de su viaje.

El grupo se pierde en un bosque y se encuentra con unas misteriosas ruinas. En su interior se encuentra un viejo cementerio de monstruos protegido por un enorme Golem de piedra.

Golem se ha unido al grupo y prosiguen si viaje buscando al Fénix. Cuando por fin encuentran un disco misterioso, son atacados por las Hermanas Semilla y al conseguir huir de ellas, por un misterioso muchacho que tiene como mascota un enorme gusano y un sueño de lo más inquietante.

El grupo es atacado por los Renegados, un grupo de monstruos que se separaron de sus amos para conseguir la libertad. Su líder es Tigre del Viento, un monstruo valiente y de gran nobleza, aunque no duda en robarles.

El grupo llega a una ciudad con un enorme coliseo, donde los monstruos se enfrentan a cambio de un premio en metálico. Ante la falta de efectivo del grupo, Tigre decide participar para ganar el premio. Sin embargo, se encuentra con un monstruo liebre que no duda en usar trampas y trucos para ganar el duelo.

El grupo llega a una aldea con un precioso campo de flores. Sin embargo, las liebres negras planean destruir una presa y arrasar al grupo de Genki y a la aldea con la fuerza del agua.

Genki and his friends continue their journey, and find a huge canyon, as well as a beat-up airplane. They take the plane, but has Genki been double-crossed by the pilot? The group must fend off the evil Kuro in order to get out of this predicament.

Genki and friends arrive in Heaven Canyon via the iron bird. In the canyon are humans mining “mystery disks” under the oppression of Moo. Are Genki and his friends strong enough to defeat them and free the imprisoned humans?

After scaling a cliff, Genki and Mocchi must free their captured comrades and find a way to defeat Clay, Pixie, and Big Blue!

In search of a mysterious disk, Monol tells of a great story from the past.

Genki and friends meet paths with the infamous Moo. Will they be strong enough to defeat him?

The Searchers, aided by the Pirate Dragons, infiltrate Moo's castle. Moo tells of how he left the village and was infused with Holly's father. He also gives Holly his dagger, which was Holly's father's, to prove it. Then Genki and his friends save her, with the help of Pixie.

The Searchers arrive to the ocean, and encounter Horn, the self-proclaimed righteous pirate. They try to get him to give them a ride across the ocean, and fight Gali's Zuum troops at the same time.

On the high seas, the team is attacked by Moo's Zillas and their leader, Gooji. Unless Golem can overcome his fear of the water, this may be the end for Holly!

After trying a shortcut, the team becomes trapped in a mysterious underground cave. Will they be able to find their way out when Moo's sinister Joker and the Evil Hares are there to wreak magic havoc?

The Searchers discover an ancient city, perfectly preserved by Hengers. But, the robot caretakers are programmed to prevent anyone from entering it! When the Hengers take Holly's pendant, Genki and his friends must trust a malfunctioning Henger, who was banished from the city because of his free will, to find a way inside.

Suezo has always been happy to let others do the fighting for him. But, his friends have begun to take him for granted, and when Hare points out that he has no Special Attack, Suezo takes the criticism pretty hard. Genki begins to try and train him, but does Suezo have the courage it takes to show what he can really do?

Pixie returns, and helps Genki in a battle against a group of Scale Jells. But she and Genki become separated from the others, and when Pixie gets injured, she finds she must rely on Genki to survive. At first, she is embarrassed and angry. But Genki's compassion begins to wear away at the barrier of hatred she has built around herself.

The Searchers finally confront Gali, the second of Moo's Big Four. Gali is both charming and clever, and manages to trap Genki and the others in a pit. But Mocchi escapes the trap, and the young monster must fight, alone, in order to save his friends.

The Searchers are attacked by the Black Worms, who are under Gray Wolf's command. Tiger must save the group and come over the realization that he must be the one to defeat his brother.

While wandering through a hude, dark forest, the Searchers are captured by a group of Moks, led by their captain, a dark Mok named Ebony. Mocchi manages to escape, and befriends a Ducken, who had been hiding in the forest from the Moks. Can Mocchi save Genki and the others or will his efforts get his new friend captured as well?

Genki and his friends come across a trio of Centaurs, proud warriors who serve Moo, but have a code of honor of their own. They challenge the Searchers to a tournament, but there is a squad of Salamanders in the area as well, and they don't want the Centaur to have the glory of Genki's capture.

The Searchers come across a small, quiet lake in the forest. They decide to restock their food supplies with fish. However, the lake has another inhabitant, an Undine. Golem falls in love with the beautiful water spirit, but she turns out to be a servant of Moo. Will he be able to defeat her?

While running from a squad of creatures called JaggerNauts, Genki and the others stumble across a factory. The JaggerNauts follow them into the factory, and they battle. However, an android, Melcarba, is still lying dormant in the factory for millions of years and kills all of the JaggerNauts. Then it turns on the Searchers, and they have to use the lightning storm to shut down the derranged cyborg.