On a recent trip to Japan I decided to give the Klook eSIM a whirl: https://www.klook.com/activity/10939...-code-voucher/

I had Googled some poor reviews of the service provided through Red Tea Mobile, but figured, at $1.50/1GB or $3.85/3GB why not? And it seemed fine -- I didn't do anything bandwidth-intensive but it was perfectly acceptable for email, web browsing, social media, and Google Maps.