Kansai Thru Pass (Surutto Kansai) for Kansai airport-Kobe-Naoshima

Hi

I have some questions about the Kansai Thru Pass (Surutto Kansai). I would like to travel to Kobe from Kansai airport to catch the Kobe Fireworks Festival. Then head down to Naoshima from Kobe.

2 Aug (Sat): Kansai airport - Kobe
3 Aug (Sun): Kobe Fireworks Festival
4 Aug (Mon): Kobe – Naoshima (Overnight)

Just wondering if i can save transportation costs if I use the Kansai Thru Pass (Surutto Kansai) (Zenkoku or Kansai version as I am working in Japan currently). In order to get to Naoshima, I need to take to Uno station (Okayama Prefecture). Can anyone tell me if I can use the Kansai Thru pass to geto Naoshima. Will I save money? Or I should just do 'ala carte' travel? Thanks!