METAL GEAR Solid 5 Ground Zeros (condition : instruction manual missing)

Product description ※Please note that product information is not in full comprehensive meaning because of the machine translation.

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The instruction manual is out of stock.
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The introduction to the main part "phantom pain" is a story of the pain and loss of a man who turned the world into an enemy.
The next generation 『 METAL GEAR Solid 』 with the concept of "infiltration" with a high degree of freedom to depict with "photorealistic" images and world view is introduced at last.
In 1975, a few months after the 『 METAL GEAR Solid Peace Walker 』, Snake sneaks into a US military base at the southern tip of Cuba.
It is a "free" and "real" undercover mission in which he thinks of all the methods from infiltration to escape by himself.
What did Snake see there when he was on his way to rescue the boy Chico who was captured at the US military base?