Haruto, Asahi, and Satsuki go out to sea on the pirate Alwida's ship having been tipped off about a legendary sword somewhere underwater. Haruto locates it and recognizes it as the sword he wielded in Union, but it is guarded by the giant sea dragon Aegir. Struggling to fight underwater, Clive arrives and helps the party retreat. Back in real world, Takanori meets up with Haruto and Satsuki and tells them that a shady organization called Gnosis is plotting something and he believes that they faked Asahi's death...