__Nationality:__ Japanese
__Affiliation:__ Japanese Imperial Royal Guard
__Rank:__ 1st Lieutenant
__TSF:__ Type-82F Zuikaku, Type-94-1C Shiranui

Amemiya Mariko is a First Lieutenant in the Imperial Japanese Royal Guard, with her Imperial Court rank being a hereditary vassal to the Shogun. She is the second in command of Takamura Yui's White Fang squadron—White Fang 2—and a close friend of hers. Amemiya is older than Yui and could be considered a calming influence, but is very precise in her work.

During Yui's participation in the XFJ Program, Amemiya presumably took temporary command of White Fang squadron and continued to support Yui's work on the Type-99 weapon from Japan.

Since 1973, an invasion of aliens known as BETA upon Earth is driving human civilization into nearly collapse. Facing an enormous mass of enemy force, mankind has developed large humanoid arms called as Tactical Surface Fighters and deployed them to its defense lines through out the world. However, all those efforts could slow down defeats but could not stop BETA, and mankind is forced to abandon major area of the Eurasian Continent. For 30 years, mankind is bogged down in an endless war against BETA without any hopes of victory. 
In 2001, the Imperial Japan faces difficulties in the development of a next-generation main Tactical Surface Fighters (TSF) as it defends the front lines of the Far East. The UN has proposed a joint development program between the Imperial Japan and the United States as a part of its international mutual development project of TSF, the Prominence Project. 
Yui Takamura, a surface pilot of the Imperial Royal Guards of Japan, is given responsibility for the project and sets off to Alaska. Meanwhile, Yuya Bridges, also a surface pilot of the US Army, was heading to the same destination. 
Yet they never knew that their encounter would change their destiny drastically. 
This story with exciting human dramas and robot actions takes place in the development of a new Tactical Surface Fighters, the most important and effective weapons against BETA, at a crisis of human extinction. 
(Source: Muv-Luv Total Eclipse Official English Website)

In 1973, following the ruthless six-year-long Lunar War, the hostile alien species known as the BETA—Beings of Extra Terrestrial origin which are Adversary of the human race—invaded Earth, killing billions and decimating Eurasia. While BETA can be destroyed with conventional weapons, their laser-class is able to wipe out entire aircraft fleets, forcing mankind to develop giant combat suits called Tactical Surface Fighters (TSF) to combat them.
 
Now in 2001, with the nations of Eurasia having fallen to the BETA, their survivors race to develop a new tactical surface fighter at a base in Alaska. Yuuya, an ace pilot with a bad attitude, is reassigned from the US army to the joint US/Japan TSF development project. There, he meets the imperial soldier Yui. They start off as constantly bickering enemies, but gradually begin to develop a relationship of trust... Amidst political tensions inherited from the Cold War, Muv-Luv Alternative: Total Eclipse follows Yui's delicate mission and Yuuya's journey to overcome the demons of the past that still haunt him.

Mariko Amemiya