Pyah!Onee-chan was shot in the left side of her head... That means the shot must have came from somewhere between the north (N) and north-east (NE).
Furthermore, there was a very slight delay after bullet impact before hearing the gun's report, nodesu!Judging by the report, the rifle used for the sniping
was a "Kar98k" sniper rifle.
...and by factoring in muzzle velocity and the time taken for the shot to land...
