A story arc that explores the fall of the previous civilization at the hands of the Honkai despite their unmatched technological capabilities. It Unravels the mysteries of the surrounding God Keys, a series of thirteen powerful weapons that were a statement of humanity's last stand.

Main Story :
# Book 1001 = Escape From The Sky
# Book 1002 = Cherry Blossom Recall
# Book 1003 = Mystery of Stigmata
# Book 1006 = Anti-Enthrophy Invasion
# Book 1007 = Gratitude Arc
# Book 1008 = Moon Shadow

Side Story :
# Book 1004 = Violet Sea Tales
# Book 1005 = Dark Sakura Tales | Guns Girl SchoolDayZ EX - Sakura Arc
# Book 1009 = Purple Kite's Tales
# Book 1010 = Secret of the God Keys
# Book 1012 = 2nd Herrscher/Lawman

Spin-off :
# Book 1011 = When Kiana Play Honkai Impact
# Book 1013 = Valkyries' Dining Escapades
# Book 1014 = Summer Memories