That was the day destiny burned.

Seeking the truth behind the "Biscatonic Cluster Incident", which claimed an unprecedented number of victims and turned Death Gavan evil, Gavan Infinity —Reiji Doki— sets out for Planet Alkam, one of the planets where the incident took place. There, Gavan Raiya —Kunai Kazanami— who was tracking Death Gavan’s whereabouts, also appears from across dimensions…