A teenage girl who becomes dissociated and mute after surviving a bus hijacking. She gradually communicates and relaxes under Makoto's care, ultimately finding healing during the final journey.
Makoto assumes a parental caretaker role for Kozue after the family collapses.
Akihiko is Kozue's older cousin who steps in to help care for her.
The Mother leaves Kozue and her brother after the traumatic hijacking event.
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