It's supposed to take place after the main 3 graduate and that they won't be actually in the series so I wonder what the plot will be

Looking at the first pic at first I thought the guys were Yuki and Kyo but if they wont be appearing then wouldn't really fit

then it hit me... could they possibly Momiji and Haru?

or not... the bottom of Haru's hair was black and the top was white/silver