Godbreaker Festival (破神祭Hashinsai) is a festival held in the Green World.
Z/X Encyclopedia Entry
A festival held to celebrate the subjugation of the Wicked Dragon and the Supreme God Gilgamesh, as well as the apparent repulse of the Dingir. The Leafer takes on the leading role, calling engineers and the likes from the other worlds, and accomplished various events over the course of one week.
The heart-touching voice of the honest idol Pecteilis, who made her debut in the final special live performance, is highly appreciated.