Dark Violets 4 Shisha no Kaijitsu

is the fourth volume of the Dark Violets light novel series, written by En Mikami and Illustrated by GASHIN. It was released under the Dengeki Bunko Imprint in July 2003.

Synopsis
Akira Kamino, a boy with "purple eyes" who can see the existence that is not a thing of the world, and Mihiiragi, a girl with "purple hands" who can touch it. With the "purple gun" left by their grandfathers, they have defeated many "monsters of the eternal world." Naoko Tanuma, a first-year student at Kamioka Kita High School, who attends the two, follows in the footsteps of her disappeared sister, and she gets a strange "seed." When it takes root in the backyard of Kamioka Kita High School, which springs up at the school festival, the forbidden fruit causes tragedy! What is the secret of "non-time fragrance" that brings immortality to those who say it? Popular horror The fourth in the series.

(source: Bookwalker JP - Translated)