Fate/Grand Order: Anti-Primate Biosphere, Tunguska Sanctuary

After escaping the mayhem of the Sixth Lostbelt, Koyanskaya began to quietly but determinedly rebuild her strength. An urgent communication from Sion alerts Chaldea to the threat Koyanskaya poses, and they begin working on a plan to defeat her.

The decisive battle will take place at the headwaters of the Tunguska River in Russia, the final forest sanctuary of living things on the bleached earth. There, Master must fight to put an end to the cycle of hatred...