The old town of Tokyo is buried under water following a terrible catastrophe which has occurred several years before. Aika and her young partner Rion work for an agency specializing in the recovery of old relics, but the owner has serious financial problems. This is why it was decided that Aika again take up her old activities as a special agent...

The team of Aika finds themselves involved in space in the hope to carry a term to the intrigues of Hargen of which all the parts are in place to put at execution its terrible plan. But quickly Aika will be confronted with an adversary of size, Neena. which carries on it an object which confers to him capacities semblabes with those of its gilded long-line bra from now on inoperative. The combat is announced hard

During her overtime at the office, Aika is suddenly attacked by an agent of Delmo which manages to escape afterwards. Little time after, the building in which Aika is in explodes. Rion and her friends attend a funeral for their friend. With the assistance of Maypia and Gusto, Rion decides to infiltrate the enemy base to avenge the death of Aika.