Kazuhiro and Marie thoroughly enjoyed their day in Japan. Back home, they wonder if they can return to the fantasy world by sleeping together again. However, even if they manage to go back, they would return to the deepest part of the ruins, right before the very eyes of the Arkdragon that attacked them. Based on anecdotes about the Arkdragon, the two prepare a "secret strategy" before holding each other tightly and falling asleep. What will Kazuhiro pull out when he wakes up in the fantasy world, amidst the roaring of the Arkdragon...!?