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Summary: Michiru Kita is a weak-spirited girl who has a hard time speaking her mind. One day she notices mysterious, ring-like markings around the necks of two of her classmates, two boys who miraculously survived a horrible accident six months before. Michiru, possessing the rare ability to see these rings knows that they warn of impending death. Thinking that maybe she can do something to save them, she approaches them...but it seems the boys have already made some other kind of deal and garnered themselves a heavy debt in the process.....