19 Year old Jupiter Dreygon is new in town, actually he's new to Japan. Just moving there for college, he's expecting to have a normal college boy life, studies, parties, alcohol, girls (and boys). But all that changes when he meets Jason Vesper, another American boy who's a little more adjusted to life in the land of the rising sun. 3 months into Jupiter's freshman year at Teikoku University, he's thrown into a world, much darker than he, or anyone else, has seen in a very long time.