If you have a Japan Rail Pass you can ride a part of the Fuji Excursion (Shinjuku – Otsuki) without needing an additional ticket. This means that JR Pass holders need to buy a ticket for the 'Otsuki – Mount Fuji / Fujikyu Highland / Kawaguchiko' section of the journey: Otsuki – Kawaguchiko: 1140 yen.