7. Bölüm: İngilizce öğretmeni Saeno Hiiragi, vefat eden hocasından bir pi kitabı alır ve bunu daha genç kendisine vermek için zamanda geriye gider.

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Saeno Hīragi, an English teacher, receives a book containing part of the value of pi from her deceased mathematics professor. After returning to the university at which he had taught, she goes backward in time and gives the book to herself as a child. (Source: Wikipedia)