In Narukawa, where video journalist Fushimi lives, a series of pranks leaves messages behind. When the death of a local ceramic artist is marked with the graffiti, 'Let us begin moral education. Who killed him?', Fushimi investigates the connection between present events and a murder from thirteen years earlier while filming a documentary about it.

Graffiti declaring the start of moral education links the present case to a murder thirteen years earlier.