4 ideas
Chinese-American historian Evan Wei and his wife, Japanese-American physicist Akemi Kirino, develop a process that lets one person witness a past moment. Wei uses it to send relatives of Unit 731's victims back to watch the vivisections and experiments at Pingfang, near Harbin, in the 1930s–40s. Japan dismisses the testimony, governments suspend the trips, and Wei, publicly vilified, takes his own life.
In the novella, the particles that let someone view a past moment are destroyed by the viewing, so each moment can be witnessed only once and then is gone for everyone. This turns history into a depletable resource. Every act of bearing witness also destroys that piece of the record for everyone else, which forces the question of who has the right to spend it.
Once the past can be physically visited, states treat past moments as territory and fight over which government controls access to events that happened on land whose borders and rulers have since changed. The dispute over Pingfang becomes a dispute over whether China, Japan or the former occupying regime has jurisdiction. Historical truth becomes subject to diplomacy and national interest rather than inquiry.
Even direct eyewitness sight of an atrocity does not settle the argument. Deniers reframe unrepeatable, private testimony as subjective, emotional or fabricated, and they demand corroboration that the medium makes impossible. Acknowledging an atrocity is shown to be a political and moral choice, not a failure of information that better proof can fix.