/jp/ - Otaku Culture

If Gensokyo acted as a singular unit to attack the world, it's no contest since 99% of the youkai can't be killed through any modern means. Even if they aren't, it'd just be back to regular old youkai infested Japan.
The only chance humanity has is to collectively decide to become onmyojis again and truly believe it's real, which seems unlikely given modern mentalities and loss of knowledge.