The Kkulf Kkulf Era refers to the period in the history of The Continent during which Kkulf Kkulf served as the Demon King. All dates that occurred throughout it are given the letter designation of "KuKu". It was the first period in history to utilize a calendar system based around the reign of its Demon King as well as the first and only time in which Round Ones served as the Protagonist Race. It is the longest era in recorded history, spanning 2,014 years, and began approximately 6,200 years prior to the start of the Rance Series.
- KuKu2014 = AV0000