After the turmoil caused by the assault on Lunapolis which sparked the "Blissful Death Wars" (as depicted in the previous installment), peace seems to have been restored, with the legendary DonPachi Corps retreating to its HQ in a space-time fold. Six years later, anomalies are detected in the space-time fabric, yet tests reveal nothing out of order, with the portals regularly functioning for both teleportation and time travel; also, the leader of the DonPachi squadron Colonel Longhena Gottvin dismisses the matter due to the lack of actual danger. Nevertheless, a technician delves deeper into the anomaly, discovering that something has infiltrated the HQ computer systems and is using the portals to send large quantities of materials and data to the past, spreading out like a virus and quickly evolving.