I can see it on JL's website, not sure where you're tying to book. JL domestic Business is called Class J on the website. Maybe they haven't released it to other sources yet. Having said that, on the JL site for that date it's full price and quite expensive. You'll see discounted rates on there much closer to your departure date. Not sure about next year becuase they are changing the fare structure, but Class J HND-ITM can usually be had for about 13-14,000 JPY each way if you book a bit in advance (not nearly a year though). Used to sometimes be under 11,000 JPY but looks like the price is up a bit this year.