Any advice on commuting in Tokyo(3days) and Karuizawa(2days)

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Hello dear locals,

Me and my friends are travelling to Tokyo for 2 days (12/4 and 12/5) then will go to Karuizawa for another 2 days (12/6-12/7) then head back to Tokyo on 12/8. I reckon we will take quite an amount of JR, any buddy would like to advise on how we should purchase our travel ticket budget wise and non hassle wise? 

Many thanks!

Austin

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