愈快乐愈堕落

　　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.

 这次特别篇的舞台，是吉宗治世20多年后的江户城。原创系列中年轻的将军吉宗也面临着六十大寿的继承问题。剧中保留了系列的世界观和魅力，在继承问题上摇摆不定的吉宗和江户城内的人们的模样，以及在城下町发生的阴谋漩涡的疑难事件，将被加入新的角色和时代性来描绘。

　　威克斯教员带着他刚完成中学学业的学生们修学观光。