KATANAGATARI

When this country was a warring country, when times were troubled times—
In the darkness of unsettled history, there existed several that quietly dispersed the sparks of their lives. Their names were, the Maniwa Ninja Corps. As “shinobi”, the path they chose to survive in this era was—!?

The undesiring independent–Maniwa Koumori.
The affectionate dreamer–Maniwa Kuizame.
The persistent truth-seeker–Maniwa Tefutefu.
The heretical influence–Maniwa Shirasagi.

The legend of the Maniwa Ninja Corps, the group with unusual powers that go beyond humanity and beyond the pale, begins now! Meet the Maniwa Ninja Corps, in this magnificent folding screen of warring states!

(Source: Kodansha, translated)

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