Somehow I Saw This Coming

When Konoha gets ahold of a supposed time-travel jutsu, it was only right they test it out before deciding on how to deal with it. As the Hokage's best friend, of course Sakura would be the one to test it. However, when a trip fifteen minutes into the past becomes fifteen years long, Sakura finds herself strangely unsurprised. After all, Naruto never was particularly good at math.