Decapitation: Kubikiri Cycle

Now that he’s a cool college student, our anti-hero Iichan thinks his crime-solving days are behind him. Cynical, sarcastic and minimally engaged in his studies, Iichan is much more interested in his own feelings of disaffection and isolation. But despite his resolve to remain aloof, he’s pulled into the narrative when he encounters and bonds with a serial killer named Hitoshi Zerozaki – a homicidal maniac with the soul of an artist whose talent is on display at the grisly scenes of his crimes. (Source: Kodansha USA)

Iori is a high school girl who doesn't know what she wants to do with her future, and tends to run away from things. One day, she is attacked by strange dead-eyed people on her way to school, only to be saved by an equally mysterious long-haired man. Later that day, her friend at school, Jion, seems to fall under the same murderous influence. To her surprise, she finds herself capable of defending herself from his violent attack. Afterward, the long-haired man she met in the morning, Zerozaki Soushiki, arrives once more, this time to invite her to become his little sister. What has Iori become involved with, and will she be able to survive this change to her life?

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)

A series of crossover stories between characters from Monogatari and characters from Nisio's other works. Originally, 4 crossover short stories were released during the theatrical screenings of each Kizumonogatari movie. The stories were bundled up into Mazemonogatari, and included 3 unreleased stories. Includes 15 stories: Kyouko Balance Jun Build Nomi Rule Mayumi Red Eye Kuroneko Bed Risuka Blood Hitei Clear Iori Fugue Shiogi Ranger Akari Triple Rizumu Rock 'N' Mikoko Community Kuu Invisible Rai Roulette Magakoro Finisher