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 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

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 second installment of the Sekai Series.
 
The music room in the second semester at Kazusaen Middle School, where the clock tower is not repaired. The relationship between Byouinzaka Meiro and Kushinaka Choushi began there. The school's three eccentrics, Kushinaka Kogushi, Douno Kurori, and Gakemura Rouya, maintain a distorted balance. And then a murder occurs. The search for the culprit begins, with Meiro and Choushi playing detective, and the collapsed balance is further shattered...
 
(Source: Kodansha, translated)

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