Mayu
About
San's best friend and a transfer student from Tokyo. She comes from a distinguished family on the Okinawa island, and is tall and good-looking. As the war worsens and the situation becomes dire, she gently casts a spell to protect San's world.
(Source: Mangapedia, translated)
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The Kanji for Mayu is "繭", meaning cocoon.
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Mayu is actually a boy.
