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Musubimonogatari

結物語

Prequel

novel
The girl who was once a god, Nadeko Sengoku. She, who followed her dreams and was forced into reality, is successful in creating alter egos by borrowing the power of the little girl shikigami, Yotsugi Ononoki.
However, the four "Nadekos" run away, scattering……?
The Oddities! Oddities! Oddities! of these modern days.
Youth is being unable to control even oneself. 

(Source: Kodansha, translated)

Sequel

novel
It's chic to go saving a girl who has nothing to do with you every once in a while. Female students from Naoetsu High School have gone missing one after the other. When the mummified bodies of the girls are discovered, there's a very distinctive marking left on the napes of their necks...? Koyomi Araragi, now a first-year university student, goes on the move to track down the culprit! The curtain opens on Monogatari Series: Monster Season! 

(Source: Kodansha, translated)

Other

novel
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