Planet "Antares" of water with which 90% of surface of the earth is filled in sea. An original civilization that made the best use of plentiful resources developed around capital "Ishutal", and people were made to promise long prosperity. However, the invasion of next star "Betelgeuse" that dries up the resource is undertaken, and the prosperity is lost. After that, in two years. Special force that challenges keen terrorism war to regain capital "Ishutal". It carves and cogwheel begins to move when a mysterious girl will show up in the near future of front that becomes tense, "Bright red witch", and feared Eo. Enjoy!