Utsumi and Seto's daily routine is to spend their afterschool hours just jabbering with one another along a riverbed. Getting excited over trivial word play, agonizing over the content of an email to be sent to a girl, and, at times, talking about a serious problem, the two endlessly engage in meaningless idle talk as if it were meaningful.
In a valley, with a dense growth of trees, a baby is killed. The baby's mother Satomi is arrested as the prime suspect. The police also learn that Satomi is involved in a romantic relationship with her next door neighbor Ozaki. The information was provided by the neighbor's lover Kanako.
Yuki is a 2nd year high school student. She volunteers at a paediatrics ward for her summer vacation, because she wants to witness the moment a person dies. She got that thought after feeling envious of a transfer student's story of seeing a friend's dead body. Yuki has friend named Atsuko. She was bullied in the past and has anxiety issues. She volunteers at a nursing home for her summer vacation, hoping that she will gain courage if she sees the moment a person dies.
