Misaki Touhouin
Misaki is Ikuto’s little sister. Her first person pronoun is “watashi” and she calls Ikuto “onii-chan”.
She’s first shown when Suzu and the others see a picture of her with Ikuto and mistake her for his lover. She loves all animals, and has a terrible sense of direction like Shinobu.
During the final episode, she appears on a boat with the men from the village. This was an anime-only development.
Misaki’s first real appearance in the story is 4 months after Ikuto arrives on Airantou. She takes the form of an armored youkai who kidnaps Ikuto and attempts to take him off the island. It turns out she’s a half yuki-onna, and not blood-related to Ikuto. Furthermore, she confesses her love to him and kisses him. She ends up deciding to stay with Ikuto on Airantou.
A skilled practitioner of aikido whose breasts are larger than Suzu’s. She was already in love with Ikuto by the time her youkai side manifested around 10 years old and she found out they weren’t blood-related. Now living in Suzu’s house along with Ikuto, she’s continually bewildered by the island girls’ lack of common sense about boy-girl relations just like Ikuto was when he first showed up. She’s currently 14 years old, having been born 3 months after Ikuto.