In a pivotal moment in human history, Earth teeters on the brink of collapse as the interdimensional Sirens unleash chaos across realities, threatening the very fabric of existence. Among those bravest at the forefront are two steadfast warriors, Okita Sōji, a skillful Battlecruiser haunted by her past, and Ashitaka, a noble Battleship, forced to accept her failures. Bound by an unbreakable friendship, they endeavor to protect their loved ones amidst relentless loss and devastation.

Ripped from the shattered landscapes of their own crumbling world and separated from one another, they learn of alternate Earths, where life continues unspoiled. Yet, even in these untouched realms, dangers loom and the Siren treat is ever-present. In search of one another, both Okita and Ashitaka meet a diverse cast of characters, both friend and foe —each carrying their own burdens and secrets—who must confront both external threats and internal conflicts.

In their quest, Okita and Ashitaka learn that survival often necessitates sacrifice, and that every friend can become a foe when the stakes are at their highest. Can Okita find her friend Ashitaka again before the never-ending war consumes them both? Will humanity stand tall or be swept away by the Siren’s relentless tide?

"Azur Angel" is a gripping tale of resilience, companionship, and the harrowing choices that define humanity when faced with its greatest trials. Join Ashitaka and Okita on their journey throughout time.