Kaja Bergmann

A former German exchange student and Arashi’s closest companion, this spectral figure serves as a calm, composed foil to her friend's energetic nature. Though she shares the unique ability to travel through time, her supernatural connection is specifically limited to interacting with living girls. Her poised and polite temperament provides a striking contrast to the lively atmosphere of their school days, marking her as a significant figure from Arashi's past.