Sayu Yagami

Sayu Yagami (夜神 粧裕, Yagami Sayu) is Light Yagami's kindhearted younger sister and plays a minor role in the main storyline, remaining unaware of Light's possession of the Death Note. Sayu, born on June 18, 1989, is a 14-year old second-year student (8th grade) at Eishu Junior High School (英集中学校, Eishu Chūgakkō) at the beginning of the story. In line with her age and grade in school she seems to demonstrate age appropriate behavior such as watching shows starring Hideki Ryuga and asking Light for help with mathematic homework, including quadratic function assignments. She seems to look up to Light, as she sees his intelligence and believes that he will become a quality detective.

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