I don't follow Aika, so again there are doubtless many plot devices and references I don't catch in this one. I guess this mission takes place on a ship or sub of some sort (The Hagen ship, probably?). And I don't know who is coming at the end (I think it's B.A. Bandora). Let the Aika fans attack me now
I think Aika and company are being held on the Hagen ship and Gust Turbulence is sent after them.
On the last page, it appears that B.A. Bandora is coming to take out the hagen ship, but Gust hasn't completed his extraction due to the hanky-panky on the boat. Gust and Aika's sex noises can be heard from outside the ship. The pilot has a flashback to Gust telling him "If the time comes and I haven't returned, push the button for me!" So the pilot's like "gotta do whatcha gotta do" and pushes the button. BLAM! Ship blows up, pilot zips away with an audible sigh. Gust finally got a release of his sexual tension but they all died for it.