Following the failure of NIFL's operation against 'Red' Basilisk, Tear collapses in pain and is sent to the infirmary. After that development, the Counter-Dragon Squad starts planning its own operation against the Dragon, intending to attack it by using the volcanic island and the horizon line as cover. While practicing his anti-gravity abilities that he gained from 'White' Leviathan, Yuu comes across Iris, who is also training. Although he tries to clarify their relationship, Iris asks him to wait until the battle against Basilisk is concluded in order to focus their efforts on protecting Tear. Some time after, the Counter-Dragon Squad takes position behind the island's volcano and prepares to attack Basilisk. However, just as they launch their attacks, Basilisk intercepts them, having somehow foreseen their actions, with the enhanced Catastrophe.