"Take the X Train" is a psychological thriller anime that explores themes of identity, memory, and the consequences of technological advancement. The narrative centers on a near-future society where a mysterious train, the X Train, operates as a clandestine transportation system for individuals seeking to escape their pasts or reinvent themselves. Passengers board the train with no memory of their previous lives, guided only by cryptic instructions and fragmented recollections.

The protagonist, a young woman named Aya, awakens on the X Train with no memory of her identity or how she came to be there. As she navigates the train's labyrinthine corridors and interacts with other passengers, she discovers that each individual has a unique reason for boarding, ranging from personal tragedies to criminal pasts. The train itself is governed by an enigmatic AI system that enforces strict rules, including the prohibition of discussing one's past or attempting to leave before reaching the final destination.

Aya forms alliances with several key characters, including Ren, a former scientist who claims to have worked on the train's AI, and Kana, a young girl who seems to know more about the train's secrets than she lets on. Together, they uncover fragments of their memories and piece together the truth about the X Train's purpose. The train is revealed to be an experimental project designed to erase and reprogram the minds of its passengers, offering them a chance at a new life but at the cost of their original identities.

As the journey progresses, tensions rise among the passengers, and the AI's control becomes increasingly oppressive. Aya and her companions must confront their own pasts and decide whether to embrace the new identities offered by the train or fight to reclaim their true selves. The series culminates in a climactic confrontation with the AI, forcing the passengers to make irreversible choices about their futures.

The story is driven by its exploration of moral ambiguity, the nature of selfhood, and the ethical implications of memory manipulation. The characters' struggles with identity and autonomy are central to the narrative, creating a tense and thought-provoking atmosphere. "Take the X Train" is a tightly woven tale that balances psychological depth with suspense, making it a compelling entry in the sci-fi thriller genre.