"I'm in Love and It's the End of the World" is a manga series that blends elements of romance, science fiction, and psychological drama. The story centers on Futaba Ichinose, a high school girl who experiences a profound and unsettling transformation in her life after a mysterious meteorite crashes near her town. This event triggers a series of apocalyptic phenomena, including the appearance of strange creatures and the gradual disintegration of reality itself. Amidst this chaos, Futaba begins to develop intense romantic feelings for her classmate, Shuji Hanamoto, who remains emotionally distant and enigmatic.

As the world around them deteriorates, Futaba's emotions become increasingly volatile, mirroring the instability of the environment. Her love for Shuji grows obsessive, and she struggles to reconcile her feelings with the impending doom. The narrative explores the tension between personal desire and existential crisis, as Futaba's internal turmoil is juxtaposed against the external collapse of society. Shuji, meanwhile, harbors his own secrets and emotional scars, which complicate their relationship further.

The story delves into themes of isolation, the fragility of human connections, and the impact of love in the face of annihilation. Supporting characters, such as Futaba's friends and family, are drawn into the unfolding catastrophe, each grappling with their own fears and relationships. The manga maintains a somber and introspective tone, emphasizing the psychological and emotional struggles of its characters as they navigate a world on the brink of destruction. The interplay between personal drama and global catastrophe creates a compelling narrative that examines the human condition under extreme circumstances.