During the millennium bug crisis, Fuyuki City entered the new century and sudden strange phenomena occurred frequently.
The light veins flowing from the origin of life, the broken reality of sacrifice in exchange for a good harvest, the master of White Snake Mountain entrenched in the distant mountains... Can Fuyuki City, which is no longer peaceful, still be able to welcome its fifth Holy Grail War?
The new insect master Matou Shinji said that Fuyuki must be saved, Kiritsugu must be saved, and Shirou must be saved!
PS: The characters that appear do not involve F/GO and Mushi Master, only F/SN. The protagonist's power system is borrowed from "Mushi Master", but I will try my best to make it understandable for little angels who don't know Fate and Mushi Master.
Mission: Cherish time and protect justice