Character profile
Kai Miyagusuku
宮城カイBiography
Kai Miyagusuku is Saya's adopted older brother, once a popular student and star athlete. He quit baseball shortly before Saya's arrival. He has been getting into more fights at school.
Story spoilers
His father's death forces him to grow up and try to keep his family united. Kai later struggles with learning that Saya, and eventually Riku, are not human.
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