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Suddenly, a fleet of ships with mysterious superweaponscalled the “Fleet of Fog” appeared all around the world.Humanity didn’t have the technology to fight such a fleet,so they were driven out of the sea...Seventeen years after the battle, for some reason,Gunzou Chihaya and his crewmates aboard the I-401and the personification (Mental Model) of the I-401,Iona, started fighting the Fleet of Fog...
Plot: After the end of the One Year War, a man named Led Wayline was recruited to serve in the Federation Survey Service. One thing is though, Led has no idea who he was. But as the time passes by, he gets some dreams of his ties with a Zeon pilot named Johnny Ridden.