They are now saying they will fly SJC-NRT and NRT-SJC on Monday, Thursday, and Saturday, starting December 22.
Their website is terrible to navigate. They charge extra for carry-ons, baggage, and meals -- at least. Maybe other things too and except for various packages, it's unclear how much the charges are for each individual item.
Among other things, you need to know your passport details in order to even book a ticket.