Rin is the main heroine in the story. She is the younger sister of Kyousuke Natsume and is the only female member out of the five original members of the Little Busters. She does not communicate well and is seen as inarticulate. Due to this, she is anti-social, and is usually seen alone. When playing baseball with the others, Rin is an ace pitcher, although she used to be quite a bad pitcher—her throws would go in completely unpredictable directions—until she gets into a baseball stand-off between Sasami, where she demonstrates two "super-power" pitches, where one of them is a fastball and the other one is her own version of a changeup. Rin loves cats and at school takes care of several strays; it is not uncommon for several cats to crawl onto her. One such extremely overweight cat she named "Dorj"; other, much smaller, cats she has named "Hitler", "Fabre", "Tezuka", and "Isoroku". Rin often has a white kitten named "Lennon" with her which rides either on her head or shoulder. Rin's name means "bell", and she wears a bell in her hair. She is one of the two survivors of the bus accident.
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