After the events of Rance 3, Rance and Sill find themselves on the floating island of Ylapu were they find themselves swept into a race to stop the awakening of an ancient super weapon from lost times.

Humans and monsters shared the Continent in a delicate balance for over a thousand years, but it all came crashing down. The most powerful fiend, Kayblis, seized power over the Monster Realm and led a colossal army on an invasion of the Human Realm. Unable to stop quarreling amongst themselves, the human nations were trampled. Two weeks after the war began, the death toll for humanity reached approximately 12,000,000. Yet mankind still couldn't unite, and the turmoil between the world's leaders continued. Just as the demise of humanity, the worst case scenario, weighed heavy on everyone's minds... "Everyone should just work for me. I'll crush that Monster Army no problem." It was Rance, back from an adventure with his companion, Sill. There was an uproar among the world leaders: The Kingdom of Leazas's Queen, Lia Parapara Leazas. The Kingdom of Zeth's Viceroy, Magic the Gandhi. The Republic of Helman's President, Sheila Helman. The Free City Alliance's Representative, Copandon Dot. The eastern island of Nippon's Lord, Kou Oda. The world's largest religion, Alicism's Pope, Crook Mofus. ...And they were also Rance's women, so they all agreed. Rance became humanity's supreme leader and their final hope. Over 6000 years a minuscule creature called Kayblis fought and slaughtered his way to the very top of the Monster Realm. A conceited man named Rance, who declares all women to be his, lives a carefree life and finds his way to the top of the Human Realm. Both men put the survival of their entire race on the line in an inescapable struggle to the death. [From [url=http://mangagamer.org/rance/10/] MangaGamer[/url]]

あらすじ ランスとシィルが入り込んだのは最後の一人が脱出不能という「玄武城」。そこにはリズナという女の子が閉じこめられていた。 システム 移動・戦闘など、すべての行動に乱数的要素を用いた変り種のゲームになっており、章ごとの制限時間を使い切らないよう各種行動をしていく。アイテム入手は装備を含めてほとんどドロップに頼らなければならず、持てる数も20個程度となっており取捨選択も必要。このため運に左右される部分が大きいが、サイコロやルーレットの出目をある程度操る事も可能。女の子モンスターを捕まえてパーティに組み込む事も出来る。

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。身为一国国王，却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，出狱后加入抵抗组织アイスフレーム，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……

大陸に現存する国家の中で最も古い歴史を持つ軍事大国、ヘルマン帝国。 歴史の中で長く世界最大最強の国家であったこの国は、 数年前から続く腐敗政治によってぼろぼろに荒廃し、疲弊している。 いずれ内乱が起きるか、隣国に攻め込まれるか、その両方か―― 少なくない人々がそんな終焉を予見する中、 かつて国を追われた男が立ち上がった。 数年前に功を焦って隣国へ侵攻し、失敗して行方をくらませた皇子、 パットン・ミスナルジ。 いつか国を取り戻すと誓った彼は修行を積み、たくましく成長して帰ってきた。 「修行の旅で知り合った一騎当千の猛者を集め、少数精鋭で革命を成し遂げる」 その作戦の仕上げにパットンが協力を頼んだのは、 最強の鬼畜戦士ランスだった。

In the far east nation of Nippon, a plethora of feudal lords are fighting for supremacy in the 4th Sengoku Era. After doing immeasurable damage on the Continent, the brute known as Rance traveled with his slave, Sill, to the island country. For a hot spring vacation, you ask? Wrong. While they'll go to some hot springs, Rance's goal is to bang all of Nippon's beautiful princesses, samurai, miko, ninjas, village girls, and more. In particular, he wants Kouhime of the prominent Oda Clan. When Rance becomes the ruler of one of the feudal states, he charges head first toward uniting Nippon! [From [url=http://mangagamer.org/rance/7/index.html] MangaGamer[/url]]