兰斯6 -杰斯崩坏-

这次作品的舞台是和平富裕的魔法大国ゼス，时间是《兰斯5D》的剧情之后不久。眷恋流浪的剑士生活，到处冒险（乱来）的兰斯，终于又跟多年来冒险剑士的厄运碰头了——没钱。为赚钱接下到魔法王国ゼス完成任务的兰斯，到了极度重视魔法，鄙视不会魔法者的ゼス王国，因不会魔法而遭迫害，他的奴隶シィル却因身为魔法使得到优待。被投入狱中，憋着一口恶气的兰斯，出狱后加入反ゼス集团レジスタンス，并开始着手颠覆ゼス的行动。但实际上，他只是借解放国民大名，对抓来的坏魔法使进行“体罚”，把成为伙伴的女孩子召集起来过酒池肉林的生活，极尽鬼畜之能事……

Set in the year LP0004, Rance and Sill travel to the Magic Kingdom of Zeth because they ran out of money once more. However, after offending a high-ranked minister and magic user named Radon, Rance is ironically thrown into the slave camp while his magic-using slave Sill is treated as a VIP.

Vowing vengeance, he eventually escapes with the help of an underground resistance group called Ice Flame. Currently Zeth is an extremely un-equal country, with magic users being the only real citizens and the non-magic users treated much like slaves with virtually no rights. Only groups like Ice Flame and the more violent and extreme group known as Pentagon, and perhaps the mysterious King of Zeth try to fight this cruel status quo.

Rance joins the group in order to get his revenge against the mages of the government of Zeth, and be reunited with Sill "while he's at it".