You can pay for anything you can buy online (PayPal, Skrill and most payment processors) and with Credit Card using Bitcoin.
In fact, you can create virtual credit cards with bitcoin without any verification for amounts smaller than $2,500.
However, here is the catch: It comes with around 5-10% premium to the Bitcoin spot prices on major exchanges (Coinbase, circle, etc..)
So unless you are buying with something like Gemini (where bank transfers are free) and you are not getting any premium on the bitcoin price, this is not a novelty.
I don't know how accessible Bitcoin is for Japanese consumers; and how much it'd cost (premium over spot) to buy it. But if it is, indeed, easy; this can be huge.
If you are a heavy consumer (say $5,000 per month), 5% will make around $250/month in savings, or $3,000/year. That's something worth the hassle.