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.


The Kanji for Mayu is "繭", meaning cocoon.

Mayu is actually a boy.
(Source: Mangapedia, translated)