The best way to access the 5th station of Kawaguchiko-guchi trail from Tokyo area is to get on a highway bus from Shinjuku. But some people prefer train because they want to use JR pass. When you access by train, you have to transfer at Otsuki station. Here are some pics of there. The blue line on the ground leads you to the Fujikyuko line platform. Info; Platform #1 and #2 are for Fujikyuko line. Platform #3 to #5 are for JR line.