"Will It Be the World or Her?" is a manga series that blends elements of romance, science fiction, and psychological drama. The narrative centers on a young man named Haruto, who finds himself at the center of a cosmic conflict after encountering a mysterious girl named Aoi. Aoi is revealed to be a key figure in an impending catastrophe that threatens the existence of the world. Haruto is faced with an impossible choice: save Aoi, whom he grows deeply attached to, or prevent the destruction of the planet.

The story unfolds in a near-future setting where advanced technology and supernatural phenomena intersect. Aoi possesses unique abilities tied to the fabric of reality itself, making her both a target and a catalyst for the unfolding crisis. As Haruto becomes more involved in the events surrounding her, he discovers that his own past is intricately linked to the larger conflict. The narrative explores themes of sacrifice, love, and the moral complexities of choosing between individual desires and the greater good.

Supporting characters include a group of scientists and agents who are aware of Aoi's significance and work to either protect or exploit her powers. Among them is Dr. Saito, a morally ambiguous researcher who provides critical insights into the nature of the impending disaster. Another key figure is Rina, a childhood friend of Haruto who becomes entangled in the conflict, adding emotional depth and tension to the story.

The plot is driven by a series of escalating events, including government conspiracies, experimental technologies, and the gradual unraveling of the truth behind Aoi's existence. As Haruto grapples with his feelings for Aoi and the weight of his decisions, the story delves into the psychological toll of his predicament. The manga balances action-packed sequences with introspective moments, creating a narrative that is both engaging and thought-provoking.

The series concludes with a resolution that ties together the personal and cosmic stakes, leaving readers to reflect on the consequences of Haruto's ultimate choice. The interplay between the characters' relationships and the larger existential threat forms the core of the story, making "Will It Be the World or Her?" a compelling exploration of human emotions and ethical dilemmas in the face of overwhelming odds.