The elderly woman known as "Voyante" appears consistently throughout the narrative, typically encountered along Kiyamachi Street. She charges for her fortune-telling services, with each subsequent encounter costing ¥1000 more than the last. Voyante delivers cryptic advice to the protagonist, centered on seizing opportunities. She repeatedly emphasizes that a significant chance "dangles" before him and urges him to recognize and act upon it. One recurring clue in her guidance is the word "Colosseum," which manifests differently across timelines—sometimes referencing Akashi’s interest in Roman architecture, Hanuki’s photograph, or the protagonist’s decaying wisdom tooth.

Her warnings tie directly into the protagonist’s recurring failure to return Akashi’s lost mochiguman keychain, which hangs from a pull switch in his apartment. This object symbolizes the unresolved opportunity central to his stagnation. Voyante’s interactions underscore the protagonist’s pattern of inaction and regret, mirroring his cyclical struggles through her focus on missed chances.

During the narrative’s climax, her guidance contributes to the protagonist’s realization that his idealized "rose-colored campus life" is unattainable through endless replays of the past. This insight propels him toward decisive action in the present. Across all official media—including the original novel, anime series, and sequel *The Tatami Time Machine Blues*—her role remains consistent as a narrative device highlighting themes of choice and consequence, with no elaboration on her background or personal history.