About[]
A Hirami Lemon (also known as Purification Fruit in Little Vampire) is an extremely bitter citrus. The fruit grows from a giant tree in icy Helman and can also be found underground in the citrus plantation in JAPAN. The fruit has a special property: it has the ability to delay the transformation of an individual into the Demon King. An example of this can be seen with Miki, who has managed to maintain her humanity for the last 5 years, since Gi gave her the power of the Demon King. At one point, Miki and her boyfriend Kentarou managed to escape the continent and return to their own world, but had to return to the continent after running out of Hirami Lemons, as she would have transformed into the Demon King, which would have lead to a slaughter of countless innocents. Withdrawal from the lemons will have very rapid effects on the host, as seen in one point where Miki lost all of her collected lemons after a fire in JAPAN. A few days later, during a stressful encounter, Miki temporarily completed her transformation into the Demon King Little Princess. It was only with the consumption of more lemons that she managed to revert back to Miki.
As stated before, Hirami Lemons are only a temporary measure, and eventually a combination of force of will and the lemons will become insufficient to suppress the transformation into a Demon King. The purpose behind the lemons on the continent has never been explored, such as existing for a Hero to apply the juice of the lemon on their blade in order to weaken the Demon King in their final showdown.
Ouji-sama LV2[]
In Ouji-sama Lv2, the archaeologist Dr. Helmut Jones mentions Hirami Lemons, saying that they grow once every three months on top of Mount Saren in Helman. It seems to have the same effect in the Ouji-sama universe as in Rance's as it's used in the same way for Mikimoto Kurusu.
Evenicle[]
In Evenicle Hirami Lemons serve as a counter-measure to the effects of Adan's Blood.