What if Monogatari's Ararararagi, Zaregoto's Ii and Jun "Humanity's Strongest" Aikawa, and Okitegami Kyouko no Bibouroku's titular forgetful detective all attended school together? In 2002, NisiOisiN won a Mephisto Prize prize for his debut novel Zaregoto, Book 1: The Kubikiri Cycle. Part of the 15th anniversary celebration will be 4-panel crossover gag manga Seishun Kijin-den! 240 Gakuen (240 is a pronunciation pun - 240 can be read as "Nishio," so "Youth Oddball Story! Nisio Academy"). 
 
(Source: Crunchyroll)

The first installment of the Sekai Series.
 
Two siblings in the process of crossing a forbidden line, Hitsuuchi Samatoki and Hitsuuchi Yorotsuki. Two friends, Mukaezuki Hakohiko and Kotohara Ririsu. A locked-room murder at the school cracks their worlds…
 
(Source: Kodansha, translated)

A swordless “swordsman” and a self-described “schemer” who embark on a quest to obtain twelve peculiar masterpiece blades. Featuring a gatefold color insert, beautiful interior art, and copious bilingual footnotes, this hardcover edition is the first of a quartet scheduled to collect the entire original run. Brimming with action, romance, and unexpected wisdom, often as tongue-in-cheek as The Princess Bride, and shot through with ninjas, samurais, and secret moves, Sword Tale is Musashi for a new generation and a gift for any fan of adventure. 
(Source: Kodansha USA)

The first instalment of the Boukyaku Tantei Series.
 
Okitegami Kyouko, also known as the forgetful detective. She forgets everything in a day, and solves cases (almost) immediately!
An unfortunate young man, Kakushidate Yakusuke, gets caught up in every case and is always the prime suspect! He cries out, "Please let me call a detective—!!!"
 
A swift development, a fleeting memory.
 
Will Kyouko-san be able to solve the case before she forgets its details?
 
(Source: Kodansha, translated)

Nagasaki prefecture, in Japan, is a magical kingdom. While the wizards that live there are unable to cross the ocean, and are trapped in Kyushu, they still pose enough of a threat that Americans dropped the bomb on them during WWII. The residents are worried that this will happen again, especially if the regular humans decide magicians are a threat. 
Daughter of the most powerful wizard alive, Risuka Mizukura is ten years old, and living outside Nagasaki, searching for her father and killing evil wizards. Her blood contains spells that control time, and allow her to fast-forward her own life. Her ultimate technique kicks in only when she dies bloodily -- her blood will reform into herself at 27, at the height of her powers, for one minute. 
Her guide through the world of normal humans is Kugi Kizutaka, also aged ten. Kizutaka is a genius, and a sociopath. He believes the only way for people to be happy is to be ruled by him and views everyone he meets as a potential pawn, or slave. Including Risuka. 

(Source: easternstandard.pbworks.com)

The forefront of new youth entertainment! "Now then, let's commence the Zerozaki"
 
The Zerozaki Clan is a family of demonic killers, ranked third among the Killing Names. The eldest brother whom is a leader of the clan is the user of Suicidal Tendencies (Mind Render)—also known as the Twentieth Hell—Soushiki. What awaits him on the other side of the breathless turmoil......?! The forefront of new youth entertainment is here!
 
(Source: Kodansha, translated)

The first instalment of the Saikyou Series.
 
Lonely Red, Aikawa Jun.
 
Her "now" is told.
 
The "Strongest" series begins!
 
"Argh, it's so boring. I should just kill myself."
 
Aikawa Jun, Humanity's Strongest Contractor.
 
She has become too strong, and the entire world surrenders to her at last. The contractor no longer has enemies to defeat, no requests to fulfil. But that's when love strikes for the first time! The most powerful love story that transcends the restraints of humanity. The strongest love story in the world!
 
(Source: Kodansha, translated)

Six months ago, a scream was heard all around the world, killing a third of the human population. The story follows Sorakara Kuu—the boy who is not moved by anything, whether happy or sad; whether it's comedy or tragedy.

A dropout from an elite Houston-based program for teens is on a visit to a private island. Its mistress, virtually marooned there, surrounds herself with geniuses, especially of the young and female kind—one of whom ends up headless one fine morning.
 
(Source: Kodansha USA)

Mayumi Doujima is a young girl who has been searching for a star that she saw only once ten years ago. She visits the headquarters of the Pretty Boy Detective Club where she meets five boys who are each unique in their own way. Her encounter marks the beginning of an extraordinary search for a lost star. A beautiful and dazzling mystery-adventure story starts now!
 
(Source: Funimation)

Just when we thought the darkness menacing the town had been identified, named, and tamed, clear and unclear mysteries of seasons past looming or surfacing, then resolving, not without tears, not without bittersweetness, of course, but satisfyingly, in a tripartite finale, all loose ends tied up into, or at least with, a bow…
 
The End Tale continues—if only for one last time, in a bonus stage for the ages, as our softie of a protagonist who wished for all parties involved, including himself, maturely enough, to end up happy, sees his reflected image freeze in a mirror and regretfully, regrettably, reaches for it to find himself through the looking glass.
 
In an alternate reality where bits of the world have been flipped around, the hero comes face to face with the hidden side(s) of familiar faces, along with author NISIOISIN, whose bravura attempt to reimagine character possibilities concludes, with signature flair, the MONOGATARI series proper—thank you for reading.
 
(Source: Kodansha USA)

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