Manga by author Ark Performance

Suddenly, a fleet of ships with mysterious superweapons called 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-401 and the personification (Mental Model) of the I-401, Iona, started fighting the Fleet of Fog...

Three members of the 'Federation Survey Service', Rimia Greenwood, Led Wayline and Ashley Brown Brandon are charged with collecting data that will bring the dark parts of the end of the one year war to light. Among their subjects of interest is a man named 'Johnny Ridden'. Who was this enigmatic man that seems to be shrouded in mystery. note: this manga is heavy on the mech schematics taking up many pages to describe each mech model.