Events in the year 1721 in Japan.

Incumbents Monarch: Nakamikado Shogun: Tokugawa Yoshimune

Events January 3 - The Love Suicides at Amijima (Shinjūten no Amijima) is performed for the first time at the Takemoto Theater. (Traditional Japanese Date: Sixth Day of the Twelfth Month, 1720)

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