Hitori de Shinitai 

A hardworking career woman who never married died alone, found in a miserable state. Her niece, Yamaguchi Narumi (35 and single), who was hit hard by the news shifted from looking for marriage to preparing for her death. She decided that the only way to die alone without bothering anyone and die better is to live the same way. This is the birth of a definitive beautiful human life story about facing love and death in earnest.