Tokyo has sunk into the ocean, along with most of the world, during a large-scale land subsidence. Aika Sumeragi is a salvager who works for a small company run by a father and daughter tandem. Alas, the company isn't exactly successful, and money is needed desperately. Thus, Aika accepts the very dangerous job of acquiring an artifact called Lagu for a hefty sum. The boss' daughter Rion joins Aika on this particular mission, and the two set off.
S01:E01 - BEAUTIFUL AGENT
Aika and Rion work for an agency that specializes in recovering relics. However, the agency is in terrible financial crunch. Aika returns to her life as a special agent to help.