民國中后期，官僚腐敗，道德滑坡，民生環(huán)境日益惡化。亞細亞建筑公司老板王大偉等人為了謀取私利，在工人勞保和保險上違規(guī)節(jié)省成本，導致工人意外身亡，該工人妻子在王大偉等人打麻將的茶館進行秘密復仇……

　　攝影師工藤太郎在坐飛機的途中發(fā)現(xiàn)一架太空囊墜入大海，那正是4個月前離奇失蹤的無人木星探測器赫利俄斯7號。回國后的工藤接到陪同開發(fā)公司調(diào)查隊前往塞吉歐島的工作，而塞吉歐島正位于赫利俄斯7號墜落地點的附近……　　另一方面，塞吉歐島突然出現(xiàn)巨大的怪獸，這一切似乎和赫利俄斯7號有關……

　　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.

　　在為公司勤勤懇懇工作了十五年之后，亨利（讓-皮埃爾·利奧德 Jean-Pierre Léaud 飾）卻落得了一個被解雇的悲慘下場。心中充滿憤懣的他在生活里也四處碰壁，絕望之中，他想到了自殺。可是，無論他使用什么法子，都無法成功赴死，就在這時，他在報紙上看到了一間聚集著黑道分子和殺手的小酒館，他決定去那里試一試。　　亨利雇傭了一名殺手（肯尼斯·考利 Kenneth Colley 飾），讓他來取自己的性命，然而，在此之后，亨利意外的邂逅了名叫瑪格麗特（Margi Clarke 飾）的美麗賣花女孩，兩人迅速擦出愛情的火花。生命有了繼續(xù)下去的意義，亨利不想死了，然而，他卻怎么也找不到當初和他簽訂了合約的殺手，這也就意味著，從此刻開始，他隨時都有可能遭到殺手的暗殺。