Lisa Silverman's homeroom teacher, who is known as "Ms. Ideal". She used to work alongside Jun's father, Mr. Kashihara. Ms. Okamura harbored unrequited love for him, and resented his wife, Junko. She was a collaborator on Kashihara's unreleased book, In Lak'ech, which prophesied the signs leading up to the end of days; among these portents was the return of the Fuhrer and his "Last Battalion". Kashihara later met a suspicious death when he fell in the Seven Sisters clock tower and was crushed by the gears.
"A Japanese history teacher in charge of Lisa's class. It seems she's doing some independent research..."
After the publication of In Lak'ech and the appearance of the Last Battalion in Sumaru, Ms. Okamura stations herself at the Kuzunoha Detective Agency, where she assists in shedding light on Mr. Kashihara's research on the Last Battalion. As more portents of the book start becoming true, Okamura loses her mind and decides to expedite the apocalypse; she allows herself to be kidnapped by Prince Taurus and is taken deep into Xibalba, where her delusions cause a hibernation chamber for the Mayan aliens to materialize on the ship. After the aliens are defeated by Tatsuya Suou's party, who leave Okamura behind, she is approached by Nyarlathotep. At the conclusion of the game, Okamura materializes and impales Maya Amano with the Spear of Destiny. Philemon intervenes by rewinding time and negating Maya's death, thus creating the Eternal Punishment's timeline.
"World history teacher of class 2-C who also has the first name, "Maya". I sense that I've met her somewhere...?"