If you were to purchase an esim from Roamless, it would cover both countries for slightly less that the pricing on Ubigi for each country. Additionally, any left over service from Ubigi is lost, but retained with Roamless. You would also get the discounts currently available that I wrote about a few days ago. Essentially you end up with $30 credit with a $20 purchase. If you were to use a referral code from me, you would get an additional $3 credit along with gaining me $3 besides. The pricing is close enough to not matter too much, but whatever credit you have after your trip is retained, since it has no expiration or is limited 7 or 30 day term. Message me if you want to use my code, or you can actually sign up with some free credits on their website. They have another free code = ESIM5 worth $3.75 for a total of $5 I believe.

Edited to add: Two additional features with Roamless, you can set up and test the esim in the US prior to your trip since there is no time frame for use. They also have voice service included with calling rates in Indonesia/Bali @ $.06-$.08 a minute, and $.03-$.05 a minute for Japan. The called carrier determines the final calling rate. The app itself is simple and easy to navigate, available for iOS and Android.

Either way, enjoy your trip!