When he's seven years old, Sirius Black has a brief encounter with a strange boy in the woods, who, in their short exchange, teaches him an important lesson about the nature of the Universe, only to then disappear without a trace.
Nine years later, Sirius, along with his two best friends, is a student away at boarding school, with a brand new transfer student as his roommmate--a foul-mouthed, astronomy nerd named Remus Lupin.
Between school, hormones, relationships, and the fact that he is keeping a (magical) secret away from everyone--Sirius' year starts to go a little off the rails.
Not to mention, there's something familiar about that Remus Lupin kid that he just can't seem to shake...