Darkness Visible.While training in the combat simulator, Rayet suffers a bout of PTSD as she sees a virtual representation of Nilokeras, the Kataphrakt that killed her father. Shortly afterward, Doctor Yagarai borrows the simulator program to help Marito deal with his own trauma from Tanegashima 15 years earlier. Though the program is a crude visualization of the 1999 battle at Tanegashima, Marito has a flashback to when an unknown Kataphrakt singlehandedly destroyed his entire tank battalion. During the battle at Tanegashima 15 years prior, Marito was forced to mercy kill his tank driver and friend John Humeray, as Humeray was unable to escape a flaming tank wreckage, which causes Marito to blame himself for Humeray's death. Meanwhile on Saazbaum's Landing Castle, Slaine finds himself a guest of Saazbaum, who admits he conspired to have the princess killed so as to rekindle the war with Earth in order to change the Vers Empire itself, but spared Slaine for a debt he owed to Slaine's father. Back on the Deucalion, Rayet struggles to empathize with Asseylum after being reminded of the time they took down Nilokeras. When Rayet finds Asseylum alone in the shower, she sneaks up from behind and strangles Asseylum with her own necklace, causing Asseylum to become unconscious. By the time Rayet has regained her focus, the Aldnoah drive on the Deucalion has shut down, crashing the entire ship.