query regarding rail pass

Hi ,
I am planning to travel to japan. I will be landing on 15th April in Tokyo and will be in tokyo for 3 days. On 18th i will leave for Fuji by bullet train and stay overnight in Fuji. Then next day take bullet train from Fuji to Kyoto. will stay in kyoto for 2 nights and then take the bullet train from Kyoto to nagoya. Finally the last train will be from nagoya back to tokyo.

Please advise if it will be more economical to buy the 7 day pass or the 4 day flexi pass or buy tickets for individual rides?
Thanks.