"Tsubasa: Those With Wings" is a manga series set in a post-apocalyptic world where society has been divided into the wealthy, technologically advanced Capital and the impoverished, struggling Outland. The story revolves around the search for a legendary artifact known as "Tsubasa," said to grant immense power to its possessor. This artifact becomes the focal point of a conflict between various factions, each with their own motivations for obtaining it.

The protagonist, Kotobuki, is a skilled thief from the Outland who dreams of escaping her harsh life and finding a better future. Her life changes when she encounters Raimon, a former soldier from the Capital who has defected and is now pursued by his former comrades. Raimon possesses a mysterious device called the "Tsubasa Unit," which is believed to be connected to the legendary artifact. Together, Kotobuki and Raimon form an uneasy alliance, embarking on a journey to uncover the truth behind Tsubasa while evading those who seek to exploit its power.

As the story progresses, the duo encounters a diverse cast of characters, including other Outland residents, Capital soldiers, and rogue factions. Each character has their own reasons for seeking Tsubasa, whether for personal gain, revenge, or the hope of reshaping the world. The narrative explores themes of survival, loyalty, and the moral complexities of power, as Kotobuki and Raimon navigate a world where trust is scarce and danger is constant.

The plot is driven by a series of escalating conflicts, as the protagonists face off against increasingly formidable adversaries. The Capital's military forces, led by the ruthless Colonel Shoukou, play a significant role in the story, serving as both antagonists and a representation of the oppressive system that governs the world. Meanwhile, the true nature of Tsubasa and its connection to the Tsubasa Unit are gradually revealed, adding layers of intrigue and mystery to the narrative.

Throughout the series, the relationship between Kotobuki and Raimon evolves, shifting from mutual distrust to a deeper bond as they rely on each other to survive. Their journey is marked by moments of tension, sacrifice, and growth, as they confront their pasts and grapple with the consequences of their actions. The story builds toward a climactic confrontation that tests their resolve and forces them to make difficult choices about their future and the fate of the world they inhabit.