Ise and Shima, both in their fourth year of working, are sharing a room. In order to escape their boring lives, they decide to "challenge" each other every month to do various things. One day, the challenge is...

"I'm getting married, but don't abandon me." Kiyoko Ito, 85 years old. In the days when her dementia makes it difficult for her to even recognize the faces of her family, she is suddenly visited by her former...