Total Eclipse is set in the same world as MuvLuv Alternative, at Alaska's Yukon base, test site 18, where first-class staff from all over the world regardless of country gather to work on new Tactical Surface Fighters (TSFs).
The main characters are engineers and pilots and it features many TSFs that failed to show up in Alternative.
Side Story of MuvLuv Alternative (http://www.batoto.net/comic/_/muvluv-alternative-r1922)
