I will be following the plot of kekkaishi. if you hadn't watched the anime/manga... best not to read it. Yukimura Tomine is the cousin of tokine. At the age of seven, she was introduced to a new home where she now knew she had a cousin, tokine. She then was also told she had to take over the duty to protect karasumori . But she got tired of it one day, and left.
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