Fluctlight

Fluctlight is a fictional energy source central to the plot of the anime and light novel series "Shoujo Shuumatsu Ryokou" (Girls' Last Tour). It is presented as a remnant of a pre-apocalyptic civilization, a form of residual consciousness or life force that persists in various objects and locations. Fluctlight is not a tangible substance but rather an ethereal energy that can be detected and sometimes interacted with by the main characters, Yuuri and Chi. The nature of Fluctlight is intentionally vague, contributing to the series' philosophical and melancholic atmosphere. It is often associated with memories, emotions, and the lingering echoes of past lives. The characters believe that by gathering Fluctlight, they might be able to understand the world that existed before its collapse. The concept of Fluctlight serves as a metaphor for the enduring presence of humanity and its creations even in the face of utter devastation and decay. It suggests that even when physical structures crumble, something of the essence of their existence can remain.