Hitoha Miyamizu

Hitoha Miyamizu (宮水 一葉) is the head of the family shrine and the grandmother of Mitsuha and Yotsuha. After the death of her daughter, Futaba (Mitsuha's and Yotsuha's mother), she decided to raise Mitsuha and Yotsuha herself.

She appears to be aware of Mitsuha's body switching with Taki, pointing out that Mitsuha is "dreaming" when it's actually Taki in Mitsuha's body. She also claims to have experienced something similar in her youth, but has long forgotten the contents of her dreaming experiences, and implies that Mitsuha's mother may have experienced something similar as well. She is last seen with Yotsuha, Mitsuha, and their father in his Mayoral office.

While she survived the Tiamat disaster of 2013, it is unknown what has become of her by the year 2021. It is shown that she is still alive during 2021 on the manga.