Tsukumo, Taisei and others board a high-speed boat in order to send Kai and Suzu to their hometown, Iojima. While confronting the Unknown that suddenly appears, Shinkalion N700S Kamome successfully Vehicle Combines with the ERDA Ferry, but is forced to struggle in the battle at sea. When Taisei and his friends ask Tsukumo why, it seems that he is traumatized by the sea.
