Akagi Hina

"A high school girl who has found himself in The Cage. Well-regarded both in the classroom and socially, she is now forced to navigate a stange and uneasy world without her phone. She's currently searching for a way to return to Tokyo and her beloved father."

Trivia

 * The first kanji of Hina's first name "陽" means "The Sun", which explains the title "Broken Sun; Memories Worth Holding" and her Sun Route in "The Sun and the Moon" story arc.
 * His last name contains the kanji "明" for "bight" or "light".
 * His birthday, December 22nd, is the summer solstice.