Characters	Height	Age
Kanna Hayama	~4 ft 11 in	12 years old
Yasha	~5 ft  1 in	~12 years old (physically)
Miki	~5 ft 0 in	~12 years old

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Explanation of Child of Kamiari Month Characters’ Height

Kanna’s approximate height is 4 feet and 11 inches, based on the average height of girls from Hatena Blog.

A photo from Anime Corner showed Kanna and Yasha side by side, making Yasha approximately 5 feet and 1 inch.

We determined Miki’s approximate height of 5 feet flat through the movie while she was with Kanna.

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Explanation of Child of Kamiari Month Characters’ Age

Kanna’s age was from the synopsis given in Anime Corner and MyAnimeList.

Since Miki is a classmate of Kanna, she is approximately the same age as her, 12 years old.

For Yasha, he is a descendant of the demon god, but he physically looks approximately as a 12-year-old.

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References:

https://myanimelist.net/anime/41877/Kamiarizuki_no_Kodomo

https://kamiarichild.fandom.com/wiki/Child_of_Kamiari_Month

https://nbakki.hatenablog.com/entry/Girls_Average_Height_and_Weight_by_Age_in_Japan

https://animecorner.me/child-of-kamiari-month-movie-reveals-new-key-visual-and-trailer/

https://ricedigital.co.uk/child-of-kamiari-month-coming-2021/