"IT'S MY LIFE" centers around the life of a young man named Tada Banri, who finds himself thrust into a world of unexpected challenges and responsibilities. Banri, an ordinary high school student, lives a relatively uneventful life until he encounters a mysterious girl named Rin, who claims to be a time traveler from the future. Rin reveals that Banri is destined to play a pivotal role in preventing a catastrophic event that will reshape the world. Reluctantly, Banri agrees to assist her, setting off a chain of events that intertwines his fate with a larger, more complex narrative.

As the story progresses, Banri discovers that he possesses latent abilities tied to a rare genetic trait, which makes him a target for various factions vying for control over the future. These factions include a secretive government organization, a rebel group fighting against oppressive systems, and a shadowy cabal with its own agenda. Rin, who initially appears as an enigmatic ally, gradually reveals her own motivations and connections to the unfolding conflict. Her presence forces Banri to confront not only external threats but also his own insecurities and doubts about his place in the world.

The narrative explores themes of destiny, free will, and the consequences of one's choices. Banri's journey is marked by a series of moral dilemmas, as he must decide whether to embrace his role as a savior or forge his own path. Along the way, he forms bonds with a diverse cast of characters, each with their own struggles and aspirations. These include Kaito, a fiercely loyal friend who provides comic relief and unwavering support; Aya, a brilliant scientist grappling with ethical questions about her research; and Sora, a rival with a tragic past who challenges Banri's resolve.

The plot is driven by a mix of action, suspense, and emotional depth, as Banri and his companions navigate a world where the line between friend and foe is often blurred. The story builds toward a climactic confrontation that tests the limits of their courage and determination. Through its intricate storytelling and well-developed characters, "IT'S MY LIFE" offers a compelling exploration of identity, responsibility, and the power of human connection.