"Hanako-san, Hanako-san...are you there?" At Kamome Academy, rumors abound about the school's Seven Mysteries, one of which is Hanako-san. Said to occupy the third stall of the third floor girls' bathroom in the old school building, Hanako-san grants any wish when summoned. Nene Yashiro, an occult-loving high school girl who dreams of romance, ventures into this haunted bathroom...but the Hanako-san she meets there is nothing like she imagined! Kamome Academy's Hanako-san...is a boy!

Nene and Amane manage to barely rescue Tsukasa, but they can’t breathe a sigh of relief just yet. The younger Yugi brother has made a sinister promise, and the supernatural forces of the Red House won’t let him go until he’s paid his dues...

Nene steps into the spotlight! The mermaid kingdom hasn't forgotten her, and they're back to claim what's theirs! Can Hanako protect her from becoming permanently fishy? Meanwhile, Kou makes friends with an odd ghost haunting the entrance to the middle school division. Kou has no idea who this guy was when he was alive, but that doesn't mean he can't help him solve his unfinished business! Will the junior exorcist be able to help this friendly ghost pass on...?

EXPOSÉ! FIND OUT WHAT THE SCHOOL MYSTERIES DO AFTER SCHOOL! The ghostly Hanako-kun and his mortal assistant, Nene Yashiro, usually have their hands full resolving various supernatural incidents in Kamome Academy, but how do they spend their time when they get a break from all that? Come and watch the characters of Toilet-bound Hanako-kun play games, get sick, change genders, and discover world-shaking secrets during their laid-back after-school hours!

By the Clock Keepers’ decree, the past has been rewritten, creating a new future…and suddenly, Nene finds herself in a world very different from the one she knew. The relationships between her friends are all mixed-up, her love life is in shambles, and Hanako-kun is nowhere to be found! Meanwhile, a strange rumor spreads through Kamome Academy about a ritual to summon a wish-granting supernatural. But is this little boy just lonely and looking for a playmate, or is there something more sin...

Nene and Kou want to learn more about their mysterious friend, Hanako-kun--and what better way to do that than school mystery number five, The 4pm Bookstacks! The rumors say that a secret door in the library leads the way to a supernaturally special collection. The Bookstacks know everything about everyone who's ever 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!

Through the workings of the School Mystery Clock Keepers, Kamome Academy's entire student body is covered in wrinkles!? To restore peace to the school, Hanako-kun teams up with a certain someone. Just when they thought the case was headed to its conclusion, the secret of Hanako-kun's assistant Nene is brought to light! What could it possibly be!?

Nene Yashiro serves as the assistant to the School Mystery Hanako-kun. When she is invited by enigmatic playboy Natsuhiko to a mysterious tea party, she meets Hanako-kun's "girlfriend" and his "little brother"...!? On top of that, she learns that one of the Seven Mysteries is mixed in with her classmates...

Nene Yashiro has made a pact with “Hanako-san of the Toilet,” aka Hanako-kun, to hold off the curse that has been placed on her. In exchange, she has to help him resolve the problems caused by the school’s supernaturals—starting with rescuing her friend Aoi from the clutches of the Misaki Stairs, one of the infamous Seven Mysteries. Can they reach the innermost depths of the Stairs before time runs out? And if they do, what dangers and secrets await them there...?

In an altered world, Kou and Mitsuba are drawn to the Red House, seeking answers to the memories they’ve been glimpsing of a different past. Nene and her gang follow close behind, looking to discover the fate of the Yugi brothers in this timeline. But nothing can prepare them for who they find dwelling inside—a grown-up Hanako-kun?! Nene is overjoyed, but it’s too early to celebrate. This Hanako-kun is nothing like the boy they remember, and his presence may only spell doom for the Red Hou...

Now that the gang has escaped from No. 6’s boundary, Kou has found renewed resolve to become an exorcist like his big brother. But he doesn’t expect to come face-to-face with the supernatural who disappeared not so long ago—Mitsuba! The two head off on an impromptu adventure to enjoy the city nightlife, heedless of the danger awaiting them in the dark…and in the midst of it all, Mitsuba comes out with a shocking request!

Hanako-kun's assistant Nene has suddenly been dragged inside a mirror. Through the looking glass, she meets the spirit of a young boy calling himself Mitsuba. They try to escape the mirrors together, but the threat of No. 3 of the Seven Mysteries, the Hell of Mirrors, draws nearer. Who is it that saves them just in the nick of time...!?