月読

The name Tsukuyomi joins 月 (tsuki, moon) and 読 (yomu, to read or count), yielding a god whose function is measuring time by the moon's phases. When the creator god Izanagi returned from the underworld of Yomi and purified himself in a stream, he washed his right eye and Tsukuyomi was born. Amaterasu, the sun goddess, emerged from his left eye; Susanoo, the storm god, from his nose. The Kojiki, compiled in 712 CE under Emperor Genmei, records this triple birth as the moment the sky divided into day, night, and weather.

Tsukuyomi's mythology is sparse compared to Amaterasu's extensive cult. The god appears in both the Kojiki and the Nihon Shoki (720 CE, Japan's second oldest chronicle) primarily through a single catastrophic act: Tsukuyomi killed Ukemochi, the food goddess, after finding her method of food production revolting. Amaterasu swore in fury never to look at Tsukuyomi again, and this estrangement is the mythological explanation for why the sun and moon appear at different times of the sky.

The Nihon Shoki assigns Tsukuyomi brief administrative authority as ruler of the night realm, granted by Amaterasu herself. But unlike the sun goddess, whose shrines at Ise attracted imperial patronage for over a millennium, Tsukuyomi accumulated almost no cult in historical Japan. The lunar calendar was important to agricultural Japan, but it was marked through practical rites rather than personal worship of the moon deity. Tsukuyomi remained a mythological anchor point: present in the founding narrative, absent from daily religious life.

In the 21st century, Tsukuyomi achieved global recognition through Masashi Kishimoto's manga Naruto (1999-2014), in which a powerful illusion technique is named Tsukuyomi and wielded by the Uchiha clan. The name appears in role-playing games, animated series, and pop music references worldwide. The word entered English gaming vocabulary with its full Japanese pronunciation intact, carrying its lunar mythology as ambient flavor rather than doctrinal content.