Keiko Onuki

Keiko Onuki (大貫 慶子, Ōnuki Keiko) is a minor yet important character in Battle Royale.
Nothing is known of Keiko's backstory, except that she was a student in Class 3-C at Kobe Junior High School, the same as Shogo Kawada. She was a participant in the Program that took place 3 years prior to that which the film is centered around. She and Shogo had been dating for some time prior to their participation in the program.