Shinkyoku Soukai Polyphonica Crimson S

Phoron struggles at Torvas Academy, where musicians learn to communicate with spirits. His strongest encouragement is the childhood memory of a red-haired spirit who valued his singing. When Corticarte returns, their renewed bond links an uncertain student to a powerful being with a complicated past.

Lessons and friendships soon become entangled with a threat aimed at the academy and ancient instruments of immense power. Phoron must discover what his music can accomplish when the people who believe in him are placed in danger.