Kanon (2006)

Lieder Ohne Worte of an Elder Sister and a Younger Sister (1x17)

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With Shiori's birthday coming, Yuichi decides that he will try to do as much as he can for her, while she still has time. A week before her birthday, Shiori gets permission from her doctor to attend school for the remaining week, just like a regular student. Meanwhile, Kaori still insists on avoiding her, and warns Yuichi that Shiori might not survive long after her birthday passes.