Miyamizu Yotsuha

Японское имя:

宮水 四葉

She is Mitsuha's younger sister, an elementary-school student, and a member of the Miyamizu family, where she participates in rituals for her family's shrine, including, but not limited to, creating kuchikamizake as a shrine maiden. She and her sister live together with their grandmother, Hitoha, in a rural town called Itomori.

Kimi no Na wa. Wiki