Shinigami to Aru Shoujou

Toko Saegusa has a week left to live.

She was summoned to the roof of the North School Building and then pushed over by an unknown person. But she didn't die.

The one who appeared before her was a Shinigami, who told her that she should have died at that time, but her life has been extended for one week. Can she enjoy her last week of life with a god of death and her childhood friend?