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……

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.

This game is not considered part of the official Rance universe timeline, forking off after the events of Rance 4.2, as a "What if" episode. However, many characters and ideas featured in later Rance games originated in Kichikuou Rance. The game begins at the start of LP0003. The warrior Rance, accompanied as always by his faithful slave Sill Plain, has been living as the leader of a group of bandits in northern Helman after killing their previous leader as part of a job given to him by the Keith Guild. While Rance greatly enjoys the raping and pillaging that comes with being a bandit leader, the guilt-ridden Sill believes that he is in danger of losing what remains of his conscience and genuinely becoming a villain. After attacking the city of Golak, Rance's group alerts the attention of Ruberan Tser, commander of the Helman volunteer army, who launches a counterstrike on them during their second attempt at pillaging the city. Unable to fight against a genuine army, the bandits are quickly destroyed, Sill is captured by the Helman Army and Rance is forced to flee for his life. Rance evades the Helman army for several days, with both his equipment and health steadily declining all the while, before he finally passes out from fatigue along the Leazas/Helman border. He is found on the verge of death by Kentou Kanami, the personal ninja of Leazas' queen and Rance's longtime admirer Lia Parapara Leazas, who brings him to Leazas castle. After three days of recovery, Rance finally regains consciousness and, completely humiliated by his defeat at Helman's hands and desperate to rescue Sill, demands that Lia give him the Leazas Army to destroy the enemy nation. Finally seeing an opportunity to have Rance to herself, Lia agrees on the condition that he first marry her, which Rance reluctantly accepts. As the new king of Leazas, Rance sets his first steps on a path that will lead to either world domination or death. [Taken from the [url=https://web.archive.org/web/20230118041246/https://alicesoft.fandom.com/wiki/Kichikuou_Rance]AliceSoft Wikia[/url]]