The Lancer Evolution is a high-performance car based on the company's Lancer, modified for rally competition and marketed by Mitsubishi as a base vehicle for participation in the World Rally Championship (WRC). It is classified into 1st generation (based on the 4th generation Lancer), 2nd generation (based on the 5th generation Lancer), 3rd generation (based on the 6th generation Lancer (Japanese name: Lancer Cedia)) and 4th generation (based on the 7th generation Lancer (Japanese name: Galant Fortis)) according to the type of vehicle used as the base body. This vehicle is the Evo IX, the third generation Lancer Evolution. A notable feature of the Lancer Evolution is that its body structure is very similar to that of vehicles competing in the WRC. From the first generation, the Lancer Evolution was developed to be competitive under the Group A regulations (which strictly limit modifications to the exterior, engine, suspension structure, etc. from production cars) that were applied to WRC cars. In the WRC, where the Group A regulations limited the scope of modifications from production cars, the performance of the base car itself was directly linked to the performance of the race car, so Mitsubishi made a wide range of improvements to the Lancer Evolution for rally cars based on data obtained through WRC participation. These efforts bore fruit, and the Lancer Evolution established itself as the most powerful rally car ever, with Tomi Makinen winning the WRC drivers' title four times in a row from 1996 to 1999. Later, Mitsubishi decided to enter the WRC under the WRC car regulations, which had a wider range of modifications than the Group A regulations, which were based on production cars, so the technical relationship between the Lancer Evolution and WRC cars from the 3rd generation onwards was severed, but Mitsubishi continued to improve the Lancer Evolution and the 3rd However, Mitsubishi continued to improve the Lancer Evolution and in the 3rd generation, it became an extremely all-rounder machine that could be used in all kinds of competitions such as rally, gymkhana, circuit and drag racing.

In 2039, humanity has lost much of its terrestrial footprint due to the rapid rise in sea levels caused by global warming. As if in response, the 'Fog Armada', a group of mysterious warships clad in fog, appeared in the oceans around the world and began attacking human vessels with superweapons on board. The human race deployed all available forces and faced the final decisive battle, the 'Great Sea Battle', but was defeated fragilely by the overwhelming military might of the 'Fog'. All sea areas and transport routes were blockaded by the 'Fog Fleet', the political economy collapsed, and humanity was on the verge of exhaustion. ------ -Weapons Seven years have passed since the Battle of the Sea. The submarine 'I401' of the 'Fog Fleet' appears in front of cadet Chihaya Gunzo. What will the encounter with the 'I401', which is supposed to be an enemy, and its mental model 'Iona' bring to Gunzo and to mankind?

Mental model of the warship Hiei, part of the 'Fog Fleet'. She is the flagship of the First Cruiser Fleet in the Orient after the departure of the Kongou. He is the first to adhere to the Admiralty Code, and forms the Fog Student Council, of which he is the president, to purge those who disturb the public morals of the Fog. He is a staunch man, even more so than Kongou.