Pretty Boy Detective Club 2 (light novel): The Swindler, the Vanishing Man, and the Pretty Boys — Nisioisin

"From the renowed author NISIOISIN, the creator of BAKEMONOGATARI, Zaregoto Series and KATANAGATARI.
Comes a new, innovative mystery series, Pretty Boy Detectives Club!

Mayumi Doujima, a second-year student at Yubiwa Private Academy, is a girl on the hunt for a star that can only be seen once in every ten years. But it turns out that the ""Pretty Boy Detective Club""--a mysterious, non-profit organization that is rumored to secretly solve trouble on campus--has decided to help Mayumi search for the star. These five vivacious pretty boys send her reeling, and set the stage for days of risky adventure!"