"Kanata Kakeru" is a manga series that blends elements of science fiction, adventure, and coming-of-age themes. The story centers around Kanata, a young boy living in a futuristic world where humanity has colonized distant planets. The narrative begins with Kanata discovering a mysterious, ancient artifact buried beneath the surface of his home planet. This artifact, known as the "Eterna Core," possesses immense power and is sought after by various factions, including a shadowy organization aiming to exploit its capabilities for their own gain.

As Kanata becomes entangled in the conflict surrounding the Eterna Core, he is joined by a diverse group of allies, each with their own motivations and backstories. Among them is Aria, a skilled pilot with a tragic past, and Zeke, a rogue scientist who initially appears self-serving but gradually reveals a deeper sense of loyalty. Together, they embark on a journey across multiple planets, facing formidable enemies and uncovering secrets about the Eterna Core's origins and its connection to an ancient civilization.

The plot explores themes of trust, sacrifice, and the consequences of wielding power. Kanata's growth as a protagonist is central to the story, as he grapples with the responsibility of protecting the Eterna Core while navigating the moral complexities of its use. The series also delves into the dynamics between the characters, highlighting their evolving relationships and the challenges they face as a team.

Throughout the manga, the narrative is punctuated by intense action sequences, strategic battles, and moments of introspection. The world-building is expansive, with detailed depictions of futuristic technology, alien landscapes, and the political tensions between colonized worlds. The story builds toward a climactic confrontation where Kanata and his allies must confront the true nature of the Eterna Core and decide its fate, ultimately shaping the future of their universe.