is the 7 day pass worth it?

Hello! I will be travelling in japan with my partner from sept25th-oct1.

Starting in fukuoka, we then go to osaka (day trip to nara), kyoto, and end in tokyo. Our train travel days all fall within a 7 day window, hence why I was looking into the 7 day rail pass.

I was curious as to whether getting the JR pass or simply buying the one way shinkansen tickets would be more cost effective. I was having some trouble pricing it out! Thanks so much :)