Silence of life series

The boy who observes about his grandmother who made the list of her friends' names who wasn't human but youkais with a book called yuujinchou. The boy came to know more about his grandmother as well as the loneliness of the ones who lived hundreds and thousands of years(youkais).

Can see the different people's different ways of lives, how they overcome their loneliness, fear and how they ended their lives peacefully.