To Unfold A Mystery (Hiyori x Kiyotaka Fanfic)

(This story is set after the events in Volume 9) Hiyori encountered a peculiar book named 'The Classroom of The Elite'. From there, she discovered the story behind her accompanied book-buddy, Ayanokoji Kiyotaka. So curiously, what would happen by the time she discovered the true essence of the her book-buddy, that sh...