I'm not really sure. I have never seem her playing the guitar in a live although I didn't watch the whole Huma-Rhythm Tour, just the LOVE LIFE one. In the PV of Hikari it shows her playing the acoustic guitar but then I'm also not sure if it's fake. In her very old PV BUSY NOW, it shows her playing an acoustic guitar as well....at that time it was probably fake but well...I'm not really that sure
But from these official pics it looks REAL enough...but who knows =/