Yururuho, also known as Sennen Suisei (Thousand-Year Comet), appears in the anime's second season. This character is the direct embodiment of the "Wandering Spark," a thousand-year comet that originated as a manufactured satellite launched before the apocalyptic Last War. The comet's return is central to the prophecy heralding the emergence of the "Firecatcher Lord." Yururuho/Sennen Suisei represents the comet prophesied to wield the power for global destruction or humanity's salvation. The Firecatcher Lord must harvest the comet's fire to prevent catastrophe and is destined to plead with the comet for humanity's forgiveness. Manaka Iwami provides the character's voice.