See my edit above - it's NGO, not NRT. NRT would have been higher. But as I have business in the NGO area, I can just as well fly there and later take the shinkansen to Tokyo, rather than the other way round. (NB - Japan Rail Pass, Green car rules!)

NGO is however still in the cartel, so combination is clearly possible. Note, that this is OTA, not AY website, AY just couldn't handle the routing. I-class fare, same PRN & ticket number (105-) Fare Basis ITSEU1