Starting from 7th January,2019, the "International Tourist Tax" is levied when tourists depart from Japan by an international flight upon ticket purchase.
For details, please check as below.
> 「Regarding the International Tourist Tax.」
> 「Do I have to pay for the International Tourist Tax when I have a transit flight to another country after arriving Japan?」
> 「I bought a Simple Peach ticket, but cancelled it. Are the airport facility fees and taxes refundable?」