It's mainly a European pandemic. During the 14th century CE when the Black Death occurred, China and India were the two biggest and richest empires with the most literacy in the world. The probability that such significant event was not properly recorded is very low. Most of the Asian countries' history that we know today including Japan are known from the ancient and later Chinese writings [1].

[1]Japanese History Documented in Chinese Writings:

https://studycorgi.com/japanese-history-documented-in-chines...