"Water gods of the ancient Azumi tribe, versed in the way of water."
The Azumi are a tribe from Japan who excelled in fishing, it is said they are the descendents of Amaterasu, Tsukuyomi, and Susano-o, the three gods sired by Izanagi after he returned from Yomi, land of the dead. The deity Azumi is said to be a guardian of the people after which it's named, and can control the element of water similarly to its sibling deity, Isora.
"A water deity of the Azumi, a Japanese fishing tribe. It can control water. The three gods born from Izanagi after he returned from Yomi are said to be the Azumi tribe's ancestors."
—Shin Megami Tensei: Strange Journey Compendium
Azumi can be found as a common recruitable enemy in Sector Bootes.