A young girl named Lain Iwakura begins to question the nature of reality and her own identity when she receives an email from a deceased classmate. Lain finds herself drawn into the Wired, a global communication network, where the lines between the physical world and the digital realm blur. As she navigates this increasingly complex existence, she encounters enigmatic figures and unsettling phenomena that challenge her understanding of self and consciousness. The narrative framework is often fragmented and surreal, reflecting Lain's disoriented state.

The narrative of Serial Experiments Lain is often described as dense and thought-provoking, demanding active engagement from the viewer. Its exploration of complex themes such as identity, reality, and the impact of technology on society has garnered a dedicated following. The series is frequently cited for its unique visual style and its willingness to delve into philosophical questions without providing easy answers. While its abstract nature can be challenging for some, its unconventional approach to storytelling and its profound thematic depth are widely recognized.