A mysterious Fortune Teller appears repeatedly along Kiyamachi Street across the protagonist's timeline experiences. She offers cryptic advice for a fee, with her price increasing incrementally each time they meet. Her most frequent guidance presses the protagonist to recognize and seize a "dangling" opportunity, thematically linked to the forgotten mochiguman keychain belonging to Akashi suspended in his apartment.

She delivers variations of this core message in different timelines, often framing it as a choice between a path to happiness and one leading to continued frustration and monotony. Sometimes her advice specifically includes the word "Colosseum," its significance shifting with the protagonist's circumstances—referencing Akashi's interests, Hanuki's photographs, or even the protagonist's dental health.

Her role remains a narrative constant, appearing regardless of the protagonist's chosen student circle or altered life path. She acts as a catalyst for reflection, pushing him toward pivotal moments he consistently overlooks. While her identity, origins, and personal motivations remain unexplored, her presence underscores themes of fate, recurring patterns, and the consequences of inaction. The Fortune Teller maintains a consistent demeanor and purpose throughout, with no significant alterations across the story's iterations.