一個患有躁鬱症男孩的成長故事：提姆每每發作，就不能自制，言行失控、惡言傷人。母親雖心痛，卻從不責備他，也不放棄任何希望。但提姆不但沒好轉，到了青春期，反而更封閉自己，連最愛他的母親也無可奈何，迫不得已送他到療養院。 　　在專業醫療環境中，加上全家人用愛與耐心陪伴協助，提姆得以一步一步走回正軌。

In the year 2961, the time is after humanity and nature has recovered the land. A hunter named Cygnus is called to rise above his duty. He provides for Last Arc, a once nomadic band of survivors in need of food and water that is now growing scarce. The answer must be found before a group of outlandish Heretics descend upon them. Cygnus must voyage across the treacherous landscape to defend his people. Sent by Nova, the matriarch of the band, she acts based on her vision for Cygnus to find a seed of hope. The future of Last Arc is for him to discover, Cygnus ventures into a hostile landscape in search of an answer for his people. On this journey of encountering many traps and dangers, Cygnus discovers what has been hunting him is his identity.