"Last and First Idol" is a science fiction manga that explores themes of identity, humanity, and the intersection of technology and art. The narrative centers around Goto Ariko, a high school girl with a passion for singing and dreams of becoming an idol. However, her aspirations take an unexpected turn when she is involved in a fatal accident. Her consciousness is transferred into a robotic body, effectively making her the first human to achieve a form of digital immortality. This transformation allows her to continue pursuing her dream, but it also raises profound questions about what it means to be human and the ethical implications of merging human consciousness with artificial intelligence.

As Goto navigates her new existence, she encounters a world where the boundaries between human and machine are increasingly blurred. The story delves into the societal and personal challenges she faces, including public perception, the limitations of her robotic form, and the emotional toll of her altered state. Her journey is further complicated by the emergence of other individuals who have undergone similar transformations, each with their own motivations and struggles. These characters, including rival idols and scientists, add layers of conflict and complexity to the narrative.

The plot intertwines Goto's personal growth with broader philosophical and technological dilemmas. Themes of transhumanism, the nature of consciousness, and the role of art in a technologically advanced society are explored through her experiences. The manga also examines the impact of her transformation on her relationships, particularly with her family and friends, who must grapple with the reality of her new form.

"Last and First Idol" balances its speculative elements with a grounded exploration of human emotions and aspirations. The story is driven by Goto's determination to redefine herself and her art in a world where the line between human and machine is increasingly indistinct. Through its thought-provoking narrative and well-developed characters, the manga offers a compelling examination of the future of humanity and the enduring power of creativity.