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About
Shun was born in Tokyo, Japan in 2018 to an American mother and Japanese father. In this reality, the earth is in a steady decline due to pollution, overuse and subsequent scarcity of its resources, and several other factors that has led for a more serious drive to colonize another planet. Shun lost both his parents early on in life. It is implied that his family - specifically, his father - had ties to the yakuza that ended up being the cause for at least his death. As a result of this fractured family at such a young age, him and his younger brother ended up taking wildly diverging paths in life.
While his brother Takeshi joined law enforcement and became a police officer, Shun ended up falling to the same web that his father before him presumably had. He found a family again in the yakuza. Despite his brother's attempts to likely dissuade this, Shun had believed from a young age that it was likely the path he would take. This is something he actually relays to Lana aboard the Origin later; he recalls a story of trying to protect his brother from bullies only to be the one Takeshi seemed most scared of after assaulting the other boys with a baseball bat.
Even for the ways he feels like it was inevitable, he doesn't actually enjoy the life that he's made for himself. There was simply no other choice. After years of involvement with the yakuza, he knows that it's impossible to remove himself from, as he says, the "shit he's entrenched in." That's when Takeshi comes to him with a proposition: there is a company named Siren that's looking for people to colonize a new planet by the name of Thea. They offer to anyone that volunteers to aid in this mission what they refer to as Tabula Rasa or a blank slate. No matter what anyone's record, it will be wiped clean in order to begin a new life on Thea.
