The Castle Ruins Cannot Turn Back Time. Sixty years ago, the Cube and the Black Relic were discovered near the Kurobe Dam, where the United Nations built a large research facility to study them. In the present, Graham and Rita Ferreira Mendes confirm that the Cactuses are unmanned. Kennosuke and Yukina travel outside the currently uninhabited Toyama Castle, but Kennosuke fails to adjust to modern fashion and technology. Despite the Black Relic immobilized and Kennosuke being captured by the United Nations forces, he escapes custody again until Sophie Noël tackles him before two security guards activate a shock collar around his neck. Oshō Yakushi talks to Kennosuke, learning that he was just a soldier assigned to fight against the mythical invaders called Ogres. Kennosuke later uses a diversion by Koharu Shirahane to escape yet again and take her to the mountains. However, a Cactus appears and abducts Koharu. Kennosuke returns to the research facility and calls upon the Cube, taking Yukina onboard as they pursue. Although Kennosuke's sword breaks during the battle, Tom and Shenmei fortunately arrive to destroy the Cactus and rescue Koharu. Kennosuke finally accepts that he is now in the future upon seeing a cliff split in half during a battle in the past.