"Kimi o Aishita Hitori no Boku e" is a science fiction anime series that explores themes of love, loss, and the ethical implications of advanced technology. The story centers around Shintaro Narumi, a high school student who becomes entangled in a complex situation involving a mysterious girl named Ruri Ichigyou. Ruri, who claims to be from the future, reveals that she is a clone created to fulfill the emotional needs of her original self, who died tragically in a timeline that has since been altered. Shintaro is drawn into Ruri's world as she seeks to understand her purpose and identity, grappling with the moral dilemmas surrounding her existence.

The narrative unfolds through a series of interconnected events that delve into the consequences of tampering with time and the boundaries of human emotion. Shintaro's relationship with Ruri evolves as he helps her navigate her fragmented memories and the emotional turmoil of being a clone. The story also introduces other key characters, such as Ruri's original self, whose presence looms over the narrative, and scientists involved in the cloning project, who represent the ethical gray areas of technological advancement. The series examines the impact of these developments on personal relationships and the broader societal implications of cloning and time manipulation.

As the plot progresses, the lines between past, present, and future blur, creating a layered and thought-provoking exploration of identity and humanity. The characters' struggles with love, guilt, and the desire for connection drive the emotional core of the story, while the science fiction elements provide a framework for examining deeper philosophical questions. The series balances its speculative elements with a focus on the human experience, making it a compelling narrative that intertwines personal drama with broader existential themes.