The incident started with a farewell.
The world is collapsing, an anonymous document tells the world
If you want to know the cause of the collapse, come to the Clock Tower in the Border Land (the border of the world)
So the government IZH formed an army called Spark and headed to the borderland
Stop the world from collapsing
The protagonist volunteers to join Starfire
Learn the truth about the world
The protagonist is actually in a cyclic world
(I can't write, but I can embrace (=TェT=) myself who gets scolded)
Purpose: Peace-loving