Crafted by Hideaki Koyasu with illustrations by Akira Amano, these novels first appeared in Jump Square. The series kicks off with 'Hidden Bullet 1: Mukuro's Illusions' released on March 12, 2007, followed by 'Hidden Bullet 2: X-Fiamma' on February 4, 2008. 'Hidden Bullet 3: Millefiore Panic' blooms into readers' hands on July 3, 2009, paving the way for 'Hidden Bullet 4: The Funeral Flower Withers' and the delightful 'Hidden Bullet 5: Simon Cooking!'.