Transient from Old Ones who possesses winding, squirming tentacles. He is also a lecturer at Toyosu Gakuen University and a specialist in ocean construction. His appearance highly resembles a certain teacher at Shinjuku Academy, but the directions they go in are complete opposites. Rather than aim for the greatest heights with someone, he holds strong ruinous desires to sink to the deepest depths of depravity with another. He likes social meeting places for adults, and there is always calming yet decadent pheromones drifting about him. He does not belong to any of the 23 worlds connected to Tokyo, and he has the same name as a certain ancestor from another world. He seems to like his coworker who desires to investigate sunken relics. And above all, as Dagon has little desire for money he is unlikely to get into a dispute over his shares, so they mesh well.