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After graduating, she married Kazunari's older brother, Eiichi, who was her senpai in high school, and they moved to Tokyo together.
They had a happy married life, but Eiichi died suddenly two years ago, leaving her a widow.
She is a motherly woman with a ladylike and warm atmosphere.
Although she can be a little absentminded, she is an appropriately mature woman.
She appears to be easygoing, but her inner thoughts are still complex and full of conflict.
Currently, she shows a brave smile to those around her, but in her heart, she is desperately trying to recover from her grief.

Nanako is always kind and considerate to Kazunari, who is preparing for exams, but at the moment, she only sees Kazunari as her husband's younger brother.
Of course, she has no idea about Kazunari's feelings.