Gundam SEED DESTINY (Source: シャア専用ブログ)

From Yamato to Asuka (大和から飛鳥へ). First, the story of Kira Yamato was raised and started. If AA didn't become Kira's place of belonging (居場所), what would have happened? Maybe he'd join ZAFT when Athrun persuaded him and fight to the death for the sake of protecting peace of that place of belonging with Athrun, becoming the ace of shooting down enemy units and feared by the EA soldiers?

Shin Asuka is in a similar situation. Because of the war in Orb, he no longer has a place of belonging and drifts to PLANT. He applies for ZAFT and trains himself with all his might to be the top, so that he can have revenge on those who took away his place of belonging. He is also fighting to protect his place of belonging now.

Shin Asuka is possibly another Kira.

Two years after SEED where Orb was involved in the war damage and caused the lost of his parents and younger sister, Shin acts as the bodyguard of ZAFT Supreme Council Chairman Dullindal. However, Armoury One is under mysterious attack. In order to protect Dullindal, Shin boards the Gundam and witness the mysterious event unfold. With unknown motive for serving in the military and always carrying around a memento of his younger sister, his private life is surrounded by mystery.

Unlikely Athrun who's had special education to hone his talents since little, Shin must have paid much effort to get to the position of bodyguard of the Supreme Council Chairman during the two years. What purpose does he have for such endeavour?

He's meeting Athrun and Cagalli at an early stage. Since Cagalli's father was the Representative Leader of Orb when his family died, what kind of relationship would he have with Cagalli?