nope, just one year has almost passed, it has been said before that ayato was a second year student. after hatano's official appearance I thought it was kind of an error in timeline, but after this chapter confirms that they're in their last school year, hatano's probably 18
wait a second!!!! WAIT A FUCKING MINUTE???!! He said "third year studying" HUH!!!??? 3 YEARS HAVE PASSED???!!! (⊙…⊙ )Translation error??(╯°Д °)╯╧╧