The princess of a small clan named Yamamoto. The Yamamoto clan was destroyed by the Ashikaga House. Isoroku&#039;s younger brother, Taro, is the only survivor to carry on the clan name, but has been taken hostage by Ashikaga Supergod. For that reason, Isoroku came to serve Ashikaga House.    

(Source: AliceSoft Wiki)

Sengoku Rance is the tenth release of the Rance series launched by Alicesoft. The story takes place during the 4th sengoku (warring states) era of JAPAN, an area of the Rance World which parodies medieval real-world Japan. 
Sengoku Rance picks up where Rance 6 left off. Rance, after saving the nation of Zeth from destruction, ran away so he won't have to marry the princess. He and Sill ended up in JAPAN for a hotspring trip, upsetting the power balance of JAPAN, and sets the unification of its provinces in motion. Meanwhile, an ancient evil power stirs from its slumber... 
The actual story of this manga follows the daughter of one of the feudal lord defeated by Rance. She is the last guardian of the three sacred treasure rumored to end the conflict in JAPAN and is now protected by Uesugi Kenshin.

Anime adaptation of the 2013 re-release of the 1989 AliceSoft adult PC game Rance 01: The Quest for Hikari 
 
The barbaric warrior Rance loves nothing more than the company of beautiful women. Traveling around the continent with his faithful slave Sill Plain, Rance takes on odd jobs for a chance to appease his insatiable libido. Although his perverted instincts often land him in hot water, people from far and wide nevertheless laud his heroic feats.
 
While undertaking a request to locate a missing noble girl, Rance and Sill arrive in the majestic Kingdom of Leazas. As they split up to investigate several leads, Rance finds himself aiding the townsfolk with various problems, from rescuing a kidnapped barmaid to purging an undead outbreak. Amassing both fortune and females, the warrior eventually uncovers a dark secret within the kingdom that only he can stand against. 
 
(Source: MAL Rewrite)

Isoroku Yamamoto