Book Girl and the Corrupted Angel

With college exams approaching, Tohko Amano - president of the literary club, closet book-eating goblin, and shameless procrastinator - does the unthinkable and declares club activities suspended! Unencumbered by the demand of his taskmistress to deliver handwritten improv stories, Konoha finds himself helping his oft-estranged classmate, Nanase Kotobuki, in the music room after school. When one of Kotobuki's friends goes missing before Christmas, though - vanishing amidst rumors of her being an "Angel of Music" - Konoha finds himself swept up in a mystery unfolding as if from the pages of Gaston Leroux's seminal work...

[From Yen Press]