Sengoku Rance:Story

WARNING, SPOILERS AHEAD

The Beginning
Initially, Rance was just touring JAPAN with Sill for an onsen trip with the ultimate goal of H-ing JAPAN's famed beauty, Princesss Aroma. Along the way,Rance was mostly just H-ing people. One day they stopped by a tango house, and met Nobunaga and Princess Aroma (who turn out to be way under the age limit for Rance) of the Oda Clan. Nobunaga and Aroma enjoy the lives of ordinary folks, which is why they often disguise as commoners and work in the tango (several balls with a stick going through them) place. Incidentally, tangos made by Aroma are... inedible... Nobunaga and Rance got along very well. Eventually Nobunaga lets Rance run the Oda house from behind the scenes, because Nobunaga doesn't want to deal with the politics and all, finding it too much a bother.

The Possession of Nobunaga
The Demon Xavier was previously sealed in 8 different gourds. Each gourd was entrusted to 8 different houses by Tenshiism to be guarded through the future generations. Nobunaga's monkey broke the one kept by Oda house, so a portion of Xavier's essence escaped, and possessed Nobunaga. Using Nobonaga's influence, Xavier began organizing a secret group of ninjas directly under his command and began seeking out the gourds kept by the other houses. Four of his acolytes (Seiryuu, Suzaku, Genbu, and Byakko) had their seals broken as the gourds were destroyed and rejoined their master. During this time, Xavier (in Nobunaga's body) publicly proclaimed to be ill, and moved to live in the Honnou Temple where his body may get more rest.

The Honnou Temple Incident
When Xavier got five out of the eight gourds, he brutally tortured and killed a Tenshiism monk. On her visit to the temple and Nobunaga, Princess Aroma witnessed this event. To prevent her from revealing this event to others, Xavier sent his minions to deal with her. After some time passed and Aroma did not return, Rance and the others went to search for the Princess. Eventually, Rance found her with Xavier's cronies outside the Temple and killed the cronies. Princess Aroma shortly after revealed the possession of her brother Nobunaga by Xavier. AFter hearing this, Rance organizes a force to fight the demon Xavier. This force caused Seiryuu to flee and killed Byakku. When they reached Xavier, they saw that Seigan and Kentarou were both just defeated by Xavier. Rance was able to seriously injure Xavier, Nobunaga's last remaining will partially regained control of his body and resisted Xavier, causing more damage to the body. At the end of the fight, Kentarou recovered, and attacked Xavier in such a way that allowed Xavier to escape through the window. Nobunaga's body was never found, but Princess Aroma (who was waiting outside)heard (mentally) Nobunaga calling out to her. This was the last part of Nobunaga that was left, which meant that Xavier was in full control of the body.