Male nurse Shiba Munenori was arrested as a suspect in a murder case. During the investigation, female prosecutor Otomo Hidemi discovered that the mortality rate of the elderly in the nursing home where Shiba worked was abnormally high, and gradually revealed the shocking truth behind the incident. This film is adapted from the novel of the same name by the popular Japanese mystery writer Ye Zhenzhongxian, directed by veteran director Maeda Tetsu ("The Baton of Love"), and co-starred by Matsuyama Kenichi and Nagasawa Masami. The film upholds the fine tradition of Japanese "social school" films. Through a suspenseful and wonderful story, it ruthlessly reveals the biggest pain point in the context of the aging of Japanese society, and also conducts a profound reflection on the eternal theme of life. And this reflection is actually not far away from us.