Yotsuha Miyamizu

Yotsuha Miyamizu (宮水 四葉) is Mitsuha's younger sister. They live together with their grandmother. Yotsuha helps out in the family shrine, performing ceremonies with her sister.

Appearance
Yotsuha is a young girl with light brown eyes and black hair which she wears in pig tails with two different hairbands. She is usually seen wearing a blue t-shirt with an orange hoodie on top, white shorts, pink-colored knee-length stockings and brown shoes.

As a teenager, Yotsuha grows out her hair but still wears it in pigtails with two hairbands. She is seen attending high school with a standard uniform.

History
Yotsuha is commonly seen during the movie waking up Mitsuha, and, if Taki is in her body, expressing her discontent at her 'liking her boobs'.

She inadvertently revealed to Taki (while he was in Mitsuha's body) that Mitsuha skipped school one day to go to Tokyo and look for him. She expresses genuine concern for her sister following the trip.

Following the destruction of Itomori, Yotsuha migrates to Tokyo, presumably with her family members. She is seen attending high school in the city.
 * Her name "Yotsuha" (四葉) means "four leaves". The same applies to her grandmother Hitoha, that means "one leaf"; her mother Futaba, "two leaves"; and her sister Mitsuha, "three leaves".
 * It is unknown with whom she lives at the end of the film, as Mitsuha is seen living alone in her own apartment. Presumably, Yotsuha lives with her father and/or grandmother.