Is JRPass good for me?

Hi, im doing a trip to Japan, but i don't know if the Pass is going to be worth it for me.

This is my Itinerary

Day 1-4 / 19-22 March - Tokyo 3 Nights and then travel to Nagoya
Day 4-7 / 22-25 March - Nagoya for 3 Nights then Travel to Kyoto
Day 7-8 / 25-26 March - Kyoto for 1 night then Leaving for Osaka
Day 8-10 / 26-28 March - Osaka for 2 Nights then leaving for Hiroshima
Day 10-11 / 28-29 March - Hiroshima for 1 Night then Leaving to Fukuoka
Day 11-12 / 29-30 March - Fukuoka for 1 Night Then leaving to Nagoya
Day 12-13 / 30-31 March - Nagoya for 1 Night then leaving to Tokyo
Day 13-15 / 31 March - 2 April - Tokyo for 2 nights then leaving Japan.

So is a 15 day trip. and i have no clue if buying the JRPass or Just buying tickets on the spot will be better.