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Yoimonogatari

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Araragi Koyomi's university arc (Monster Season)

Oddities x Mystery

"Do you still feel like playing as detective?"

From his kouhai at Naoetsu Highschool, Higasa Seiu, comes rumours of the kidnapping of an elementary school girl.

Araragi Koyomi, now a first year university student, along with Hachikuji Mayoi, Oshino Shinobu and Ononoki Yotsugi begin investigating, but...!

This modern day oddity! Oddity! Oddity!

In the Evening (Yoi) darkness, youth shines brightly.

249 pages, Paperback

Published June 14, 2018

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About the author

NisiOisiN

288 books997 followers
Nisio Isin (西尾維新 Nishio Ishin), frequently written as NisiOisiN to emphasize that his pen name is a palindrome, is a Japanese novelist and manga writer. He attended and left Ritsumeikan University without graduating. In 2002, he debuted with the novel Kubikiri Cycle, which earned him the 23rd Mephisto Award at twenty years of age.

He currently works with Kodansha on Pandora, the Kodansha Box magazine, and Faust, a literary magazine containing the works of other young authors who similarly take influence from light novels and otaku culture. He was also publishing a twelve volume series over twelve months for the Kodansha Box line; Ryusui Seiryoin was matching this output, and the Kodansha Box website stated that this is the first time in the world two authors have done twelve volume monthly novel series simultaneously from the same publisher.

In February, 2008, his novel Death Note Another Note: The Los Angeles BB Murder Cases was released in English by Viz Media. Del Rey Manga has already released the first volume in his Zaregoto series. His Bakemonogatari, Nisemonogatari and Katanagatari novels have been adapted into anime series. Nekomonogatari (Kuro) has been adapted into an anime TV movie, and Kizumonogatari will be release in theaters this year. Monogatari Series: Second Season, adapted from 6 books in Monogatari Series will air in July 2013. Another of his works, Medaka Box (manga), has been adapted into a two-season anime series.

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Profile Image for Molly Mo.
1 review
May 22, 2026
Yoimonogatari is the twenty-fourth novel in the Monogatari series, so I'd advise against reading this before the, err, other twenty-three volumes.

Araragi heard from Higasa who heard from a friend who heard from a friend that the Higasa's friend's friend's younger sister had gone missing. Despite the lengthy explanation, the mystery behind where Kujaku Beniguchi had gone off to was quite interesting.

Benikujaku is a wonderfully interesting character and reflects well on both Hachikuji and Araragi's characters. Kujaku-chan so desperately wants to grow up. Her mother rid her of practically anything worldly as it would make her "free". Her older sister left home as soon as she turned eighteen, and so Beniguchi Kujaku-san obviously wanted to follow suit. She wanted to leave home, so she wanted to grow up. She wanted to grow up so badly that she literally did grow up. Like, physically.
Well, in the end, Transistor Slender ended up deciding to return to a child. I guess the takeaway you could make is that Benishoga-san didn't *actually* want to grow up, and she only wanted to grow up so she could be a kid, ironically.
Take it easy and grow up at your own pace.

Hachikuji never got to grow up, she's eternally ten years old. Araragi got to grow up, but he's not any good at it. It feels like he's trying so hard to grow up that he ends up falling on his face. Of course he's grown a lot, but he's definitely holding himself back. Even in Musubi he seems surprised that many of the people he's known since high school are still... themselves.
It's in my opinion that growing up is throwing out the bad, not throwing out the childish or the whimsical. It's a reason why so many adults are miserable, because they rejected their youth.

(I'm running out of ways to say Beniguchi Kujaku here, so bear with me)

The sister of Benihibari-san and her situation also gives Araragi a chance to resolve a similar situation to Hanekawa's original home situation. This seems to be a recurring theme with Monster Season, where Araragi is forced to confront his past in one way or another. The previous installment, Shinobumonogatari, is a reminder that Araragi isn't special for sacrificing himself to Kiss-shot, and that many other high schoolers in that situation would have done the same.

Good read! The body horror was definitely a bit new for the Monogatari series but it was written pretty well, and I appreciate how Nisio wove it into the mystery.
This entire review has been hidden because of spoilers.
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