It is 100% true that "七日之内，可以任意坐新干线".
Shinkansen has three categories, JR pass can't be used on the fastest one.
from http://www.japan-guide.com/e/e2018.html:
Nozomi: Nozomi trains stop only at the most important stations, and reach Osaka from Tokyo in about two and a half hours. The nozomi is one of the very few trains on the JR network that cannot be used with the Japan Rail Pass.
Shinkansen has three categories, JR pass can't be used on the fastest one.
from http://www.japan-guide.com/e/e2018.html:
Nozomi: Nozomi trains stop only at the most important stations, and reach Osaka from Tokyo in about two and a half hours. The nozomi is one of the very few trains on the JR network that cannot be used with the Japan Rail Pass.
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