Kwon, a language school instructor, stops by her old workplace and receives a thick envelope addressed to her. A Japanese instructor named Mori had proposed to her two years ago. She turned him down. Mori had immediately gone back to Japan, but now was back in Korea looking for her. The envelope enclosed letters he had written to her during his search through Seoul. After Kwon finishes the first letter in the lobby, she grows faint coming down the staircase and drops the letters. She gathers them off the floor and sees there are no dates on the letters. She now has no way of knowing the order in which they were written.
In the future, the Japanese government captures a class of ninth-grade students and forces them to kill each other under the revolutionary "Battle Royale" act.
A lonely otaku is fired from his job. He is rescued in a ruined building by a strange girl in a sailor suit. When he wakes up, the girl becomes a figure. The young man and the pretty figure begin to live together.
Mei Tachibana is a high school student. Due to a traumatic incident when she was a kid, Mei has been unable to make friends or have boyfriends. By mistake, Mei then injures the most popular male student named Yamato Kurosawa. Somehow, Yamato Kurosawa likes Mei Tachibana and tells everyone unilaterally that Mei is his friend. One day, Yamato Kurosawa saves Mei Tachibana from a stalker by kissing her. From that kiss, their love story begins.
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