Toilet-Bound Hanako-Kun, Volume 3 (by AidaIro)

“I’m not going anywhere.” 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!