The story takes place on Earth in the future, a time when science and magic coexist. There, the adventurer Rio pursues the existence of the star "Arcana", which is surrounded by legends. Rio's heart beats with a thirst for adventure and the unknown, and he senses that a new destiny awaits him beyond his adventures.

His journey began the moment he followed a legendary map and arrived at a mysterious place beyond the starry sky. Together with his friends, Rio discovers Arcana that shines deep in the universe. The stars sparkled, as if some unknown power was sleeping within them, calling out adventurers.

The moment they stepped into Arcana, they felt a strange energy surrounding them. It seemed to be fused with scientific theories and fantasy dreams, and it was like the moment a door to another dimension opened. Rio and his friends try to understand what mysteries and adventures this new planet will bring them.

Their arrival on the dazzling planet marks the beginning of an adventure. The adventurers who stood in the land of Arcana first faced a mystery that stood in their way. Why are they called deep within the stars and what kind of fate awaits them? They sensed that the adventurers were given a mission to unravel the mysteries hidden within the Arcana.

The scenery of Arcana was truly beyond imagination. Different dimensions and unknown life forms coexisted, and their beauty and mystery overwhelmed adventurers. Rio, Serena, and Kaito decide to take on the challenge of solving the mysteries of Arcana, bringing their different skills and perspectives together.

In the first adventure, encounters with the residents of Arcana awaited. They had knowledge that transcended common sense on Earth, and were the ones who conveyed the power and secrets of the stars to Rio and his friends. They say that they have lived in Arcana for a long time, and have been waiting for new adventurers to come.

As the adventurers tackled their first tasks in Arcana, the mysterious power possessed by the stars gradually became clear. The intertwining of science, technology and the power of magic has revealed that Arcana is a world of new possibilities.

At the end of Episode 1, Rio and his friends are unable to understand the great purpose of Arcana, but they are at the beginning of an unknown journey. Feeling that the next mystery and next adventure were waiting for them, Rio and his friends decided to unite and take on the new secret of Arcana.