Technically Akita Shinkansen means the line between Morioka and Akita. But most of trains are operated between Tokyo and Akita via Morioka as the train name, “Komachi” (こまち).
All Komachi trains are coupled with the fastest Tohoku Shinkansen train, “Hayabusa” between Tokyo and Morioka. Those trains are uncoupled at Morioka. Of course both Akita and Tohoku Shinkansen are fully covered by Japan Rail Pass and JR East Pass. Continue reading Direct access to Akita from Tokyo, Akita Shinkansen (bullet train)