Easyrentcars is exactly as it’s name says!

Great attitude, very efficient, and the pickup and drop-off process was very convenient.

Not bad

Absolutely highly recommended. Before renting, I didn't know that small cars cannot use the pass for certain roads. The staff calculated the cost difference between upgrading to a medium-sized car that can use the pass and continuing with the small car, including the toll fees for highways. They also clearly explained the additional costs of upgrading to a medium-sized car, allowing me to make an informed choice. The entire process took only ten minutes. The staff was very familiar and efficient with the rental process. If I rent a car again in the future, I will definitely use this service.

Had to search for a while at Shinjuku Station, but the staff was very nice and there was no queue. You need to speak Japanese, otherwise it might be slow!

Like: Car was slightly smaller than I expected but not too bad. Extremely fuel efficient so a net positive.
Dislike: The staff didn’t think to include an ETC (auto toll device) even though I asked about it and there was a car reader in the vehicle. For a >2 week rental that should be the default approach. If you are renting in Japan make sure they include it or you will be messing about with cash at toll gates (or worse, finding gates not opening as you expect).