RE: I AM, also rendered as Re I Am, is a song by Aimer. It was originally used as the ending to  episode 6 of Mobile Suit Gundam Unicorn and later used as an opening to Episode 18 of Mobile Suit Gundam Unicorn RE:0096.

U.C. 0096. Three years after Char’s rebellion, Banagher Links, a boy who lives on the manufacturing colony Industrial 7, meets a mysterious girl named Audrey Burne. She claims to seek to prevent a potential war by interfering with the transfer of “Laplace's Box” from the Vist Foundation to a Neo Zeon remnant group known as the “Sleeves”. 
However, when a Federation squad also sent to prevent the transfer clashes with the Sleeves, the colony is plunged into battle. 
As Banager races through the flames in search of Audrey, one other fateful encounter awaits him—the Unicorn Gundam, a pale white mobile suit that's the key to Laplace's Box. 
 
What is Laplace’s Box? What are the secrets that it holds? For the first time in 100 years, light will shine on the darkest secrets of the Universal Century... 
 
(Source: Gundam.info)

U.C. 0096... 
The manufacturing colony Industrial 7, which is still under construction, floats at Lagrange point 1. 
A youth named Banagher Links, who grew up without knowing his father, meets a mysterious girl who has stowed away on a ship bound for Industrial 7. As the white mobile suit Unicorn undergoes repeated tests and becomes the subject of diverse speculations, the hands of time begin to move. 
Banagher does not yet know that he has been caught up in the conflict surrounding Laplace's Box. 
What is Laplace's Box? 
What secret does it contain? 
The hundred-year curse of the Universal Century is about to be resolved. 
(Source: Mobile Suit Gundam Unicorn Official Website)

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