From publisher blurb:
In a sleepy seaside town along the coast of Japan, an ancient evil stirs. There, guarded by the monks that have sworn to protect it, sits a great obsidian Buddha statue. Resting in the center of its forehead is a faintly glowing gem, and behind it a dark mystery. Hidden in the shadows, a doomsday cult awaits for the most opportune time to release the ancient evil that hides behind the Obsidian Gate. Do you have what it takes to stop these fanatics from fulfilling their dark delusions?
The Obsidian Gate is a four act Penny Dreadful adventure for the Through the Breach roleplaying game that brings the Fated back to Earth to stop an oni-worshiping cult and the immortal spirits they have summoned from another plane of existence.