You might be thinking of a different character. For example: Reimi Sugimoto (JoJo’s Bizarre Adventure) Rumi Usagiyama (My Hero Academia) (The King of Fighters) Verification and Sources

In that moment, Dr. Watanabe experienced a peculiar jolt, a temporary misalignment of his own perceptions. When his vision cleared, Rumi was gone, vanished into the crowded streets of Tokyo. The doctor was left with more questions than answers.

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Rumi Nagase (Tokyo N0202) is a fictional, reserved character in the psychological visual novel "Abnormal Patient," whose lifestyle is defined by isolation and routine within a clinical facility. Her entertainment revolves around deep, dialogue-driven engagement with the player and solitary activities, contributing to the game's mysterious, cerebral atmosphere. Further details on this visual novel can be explored through official game materials.