Toilet-bound Hanako-kun

"Nene and Kou want to learn more about their mysterious friend, Hanako-kun--and what better way to do that than by hunting down school mystery number five, 'The Four P.M. Bookstacks'?! Rumors say a secret door in the library leads the way to a supernaturally special collection. The Bookstacks know everything about everyone who's attended Kamome Academy--past, present, and future! But whatever you do, don't read the red books...or your future will be drenched in blood!"--Back cover.