Risking his life to ensure humanity's survival, Tanikaze Nagate rides out in his silver armour, the Tsugumori!<br /><br />Thousands of years have passed since the Gauna destroyed the Solar System.<br /><br />The enormous seed ship, Sidonia, travels through space while propagating and producing humans.<br /><br />Brought up in the lowest decks of Sidonia, a young man, Tanikaze Nagate, becomes a Guardian trainee, and is authorized to pilot the outdated but historically renowned Tsugumori.<br /><br />The battle with Nagate's life at stake begins now!