The setting of this animation reminds me of Keigo Higashino's "Paradox 13". One is a strange world after death, and the other is a parallel time and space that you fall into after death. The so-called "world after death" gives people the hope of life, but they have to erase their memories one by one when they leave.
The saddest thing is not death itself, but forgetting.
——I would like to send this article to Yuri Nakamura. A second heroine who is not as popular as Mengmeng Da Lihuazao but is still handsome and lovely.
Nakamura Yuri. An ordinary girl who couldn't be more ordinary.