What's "School"?

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| ‹  [You'll Be Taking Care of Me](/wiki/You%27ll_Be_Taking_Care_of_Me "You'll Be Taking Care of Me") | [**List of Chapters**](/wiki/Yaiba#Chapters "Yaiba") | [Lots of Samurai](/wiki/index.php?title=Lots_of_Samurai&action=edit&redlink=1 "Lots of Samurai (page does not exist)")  › |
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| ***Yaiba* Chapter 3** | |
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| **Information** | |
| Title: | What's "School"? |
| Japanese title: | ガッコってなんだ   (Gakkotte Nanda) |
| Original release: | September 7th, 1988 |
| Shōnen Sunday issue: | #41/1988 |
| Volume: | (/wiki/Yaiba_Volume_1 "Yaiba Volume 1") |
| Pages: | 20 |
| Anime adaptation: | Episode 1: [Heisei's Samurai Yaiba Appears](/wiki/Heisei%27s_Samurai_Yaiba_Appears "Heisei's Samurai Yaiba Appears") |
| **Viz Media version** | |
| English title: | What's School? |
| English release: | March 20, 2025 (simulpub)[](#cite_note-1)   July 8, 2025 (volume 1)[](#cite_note-2) |
**What's "School"? (ガッコってなんだ ,*Gakkotte Nanda*[?](/wiki/Help:Japanese "Help:Japanese"))** is the third chapter of the [manga](/wiki/Manga "Manga") of *[Yaiba](/wiki/Yaiba "Yaiba")*. It was written by [Gosho Aoyama](/wiki/Gosho_Aoyama "Gosho Aoyama") and drawn by him and his [assistants](/wiki/Gosho_Aoyama%27s_assistants "Gosho Aoyama's assistants") and first released in [Shōnen Sunday](/wiki/Sh%C5%8Dnen_Sunday "Shōnen Sunday") #41/1988 on September 7th, 1988 and later on reprinted as the third chapter of [volume 1](/wiki/Yaiba_Volume_1 "Yaiba Volume 1") on April 18th, 1989. It shows [Yaiba Kurogane](/wiki/Yaiba_Kurogane "Yaiba Kurogane")'s first day at [school](/wiki/Middle_School_(Yaiba) "Middle School (Yaiba)"), where he almost instantly gets into trouble again.
## Contents
* [1 Characters](#Characters)
+ [1.1 Introduced](#Introduced)
+ [1.2 Featured](#Featured)
* [2 Settings](#Settings)
+ [2.1 Introduced](#Introduced_2)
+ [2.2 Featured](#Featured_2)
* [3 Plot](#Plot)
* [4 Continuity](#Continuity)
+ [4.1 Referencing](#Referencing)
+ [4.2 Referenced in](#Referenced_in)
* [5 Crossover](#Crossover)
+ [5.1 *Magic Kaito*](#Magic_Kaito)
* [6 Trivia](#Trivia)
* [7 Adaptations](#Adaptations)
* [8 See also](#See_also)
* [9 References](#References)
## Characters[[edit](/wiki/index.php?title=What%27s_%22School%22%3F&action=edit&section=1 "Edit section: Characters")]
Main article: [Yaiba characters](/wiki/Yaiba_characters "Yaiba characters")
### Introduced[[edit](/wiki/index.php?title=What%27s_%22School%22%3F&action=edit&section=2 "Edit section: Introduced")]
- | [Shizuka Mine](/wiki/Shizuka_Mine "Shizuka Mine") | |
| --- | --- |
|  | * Raizo's wife * Sayaka's mother |
- | [Keiko Momoi](/wiki/Keiko_Momoi "Keiko Momoi") | |
| --- | --- |
|  | * Middle school student * Sayaka's classmate |
- | [Mr. Sudo](/wiki/index.php?title=Mr._Sudo&action=edit&redlink=1 "Mr. Sudo (page does not exist)") | |
| --- | --- |
|  | * Sayaka's classroom teacher * 5th Dan in Kendo |
### Featured[[edit](/wiki/index.php?title=What%27s_%22School%22%3F&action=edit&section=3 "Edit section: Featured")]
Characters
[Kenjuro Kurogane](/wiki/Kenjuro_Kurogane "Kenjuro Kurogane")
[Sayaka Mine](/wiki/Sayaka_Mine "Sayaka Mine")
[Raizo Mine](/wiki/Raizo_Mine "Raizo Mine")
[Yaiba Kurogane](/wiki/Yaiba_Kurogane "Yaiba Kurogane")
[Kagetora](/wiki/Kagetora "Kagetora")
## Settings[[edit](/wiki/index.php?title=What%27s_%22School%22%3F&action=edit&section=4 "Edit section: Settings")]
Main article: [Setting](/wiki/Setting "Setting")
### Introduced[[edit](/wiki/index.php?title=What%27s_%22School%22%3F&action=edit&section=5 "Edit section: Introduced")]
* [Middle School (Yaiba)](/wiki/Middle_School_(Yaiba) "Middle School (Yaiba)")
### Featured[[edit](/wiki/index.php?title=What%27s_%22School%22%3F&action=edit&section=6 "Edit section: Featured")]
* [Mine residence](/wiki/Mine_residence "Mine residence")
## Plot[[edit](/wiki/index.php?title=What%27s_%22School%22%3F&action=edit&section=7 "Edit section: Plot")]
A brand new day at the [Mine residence](/wiki/Mine_residence "Mine residence") and [Kenjuro Kurogane](/wiki/Kenjuro_Kurogane "Kenjuro Kurogane") is already leaving again after just moving in yesterday, making [Raizo](/wiki/Raizo_Mine "Raizo Mine") and [Sayaka Mine](/wiki/Sayaka_Mine "Sayaka Mine") celebrate that the two troublemakers are gone. But just like he announced the day before, he left his son with the [Mine family](/wiki/Mine_family "Mine family"). [Yaiba Kurogane](/wiki/Yaiba_Kurogane "Yaiba Kurogane") follows Sayaka to school, wanting to know what it is. While her classmates are fascinated by the spikey-haired young boy, flooding him with questions, he quickly finds himself in his second battle since his arrival in [Japan](/wiki/Japan "Japan") - against the choleric classroom teacher of Sayaka, [Mr. Sudo](/wiki/index.php?title=Mr._Sudo&action=edit&redlink=1 "Mr. Sudo (page does not exist)"), a [fifth Dan](http://en.wikipedia.org/wiki/Dan_(rank) "wikipedia:Dan (rank)") in Kendo...
## Continuity[[edit](/wiki/index.php?title=What%27s_%22School%22%3F&action=edit&section=8 "Edit section: Continuity")]
Main article: [Continuity](/wiki/Continuity "Continuity")
* [Sayaka Mine](/wiki/Sayaka_Mine "Sayaka Mine") and her classmates wear summer school uniforms (June 1st-September 30th)
* Third chapter of what the fandom calls the "[Yaiba Arc](/wiki/index.php?title=Yaiba_Arc&action=edit&redlink=1 "Yaiba Arc (page does not exist)")" (Manga: Chapters 1-5, Anime: Episode 1)
### Referencing[[edit](/wiki/index.php?title=What%27s_%22School%22%3F&action=edit&section=9 "Edit section: Referencing")]
* **You'll Be Taking Care of Me (Yaiba Manga: (/wiki/You%27ll_Be_Taking_Care_of_Me "You'll Be Taking Care of Me")) :** This chapter is a direct continuation of the second one, set on the morning of the day right after the one in [chapter 1](/wiki/Yaiba_Appears "Yaiba Appears") and 2. [Yaiba Kurogane](/wiki/Yaiba_Kurogane "Yaiba Kurogane") also tries to sense [Mr. Sudo](/wiki/index.php?title=Mr._Sudo&action=edit&redlink=1 "Mr. Sudo (page does not exist)") the same way he learned to sense animals in the [jungle](/wiki/index.php?title=Jungle_(Yaiba)&action=edit&redlink=1 "Jungle (Yaiba) (page does not exist)") and like he did with [Mutou](/wiki/index.php?title=Mutou&action=edit&redlink=1 "Mutou (page does not exist)") in the second chapter.
### Referenced in[[edit](/wiki/index.php?title=What%27s_%22School%22%3F&action=edit&section=10 "Edit section: Referenced in")]
* **Lots of Samurai (Yaiba Manga: (/wiki/Yaiba_Volume_1#Lots_of_Samurai "Yaiba Volume 1")) :** The next chapter is a direct continuation of this one and is set on the same school day, after lessons are done.
* **A Samurai's Pride (Yaiba Manga: (/wiki/Volume_24#A_Samurai.27s_Pride "Volume 24")):** Yaiba turns around and tries to sense [Takeshi Onimaru](/wiki/Takeshi_Onimaru "Takeshi Onimaru")'s presence at the end of the chapter like he did with Mutou in the previous and Mr. Sudo in this one. While the audience laughs, [Sayaka Mine](/wiki/Sayaka_Mine "Sayaka Mine") is the only one who notices what he's doing.
## Crossover[[edit](/wiki/index.php?title=What%27s_%22School%22%3F&action=edit&section=11 "Edit section: Crossover")]
Keiko Momoi in chapter 3.
Main article: [Crossover](/wiki/Crossover "Crossover")
### *Magic Kaito*[[edit](/wiki/index.php?title=What%27s_%22School%22%3F&action=edit&section=12 "Edit section: Magic Kaito")]
Main article: [Magic Kaito](/wiki/Magic_Kaito "Magic Kaito")
* [Sayaka Mine](/wiki/Sayaka_Mine "Sayaka Mine")'s friend, the blonde girl with the twintails and the glasses is later on revealed to be [Keiko Momoi](/wiki/Keiko_Momoi "Keiko Momoi") during her second middle school year all along. In the [final chapter](/wiki/Yaiba_Volume_24#Are_You_Coming.3F "Yaiba Volume 24"), after a timeskip of three years, she, her [friend](/wiki/index.php?title=Keiko%27s_friend&action=edit&redlink=1 "Keiko's friend (page does not exist)") and Sayaka go to [Ekoda High School](/wiki/Ekoda_High_School "Ekoda High School") together and talk about the relationship status of [Kaito Kuroba](/wiki/Kaito_Kuroba "Kaito Kuroba") and [Aoko Nakamori](/wiki/Aoko_Nakamori "Aoko Nakamori").
## Trivia[[edit](/wiki/index.php?title=What%27s_%22School%22%3F&action=edit&section=13 "Edit section: Trivia")]
* Besides [Keiko Momoi](/wiki/Keiko_Momoi "Keiko Momoi"), there sometimes is a girl in the background of the class room looking similar to [Aoko Nakamori](/wiki/Aoko_Nakamori "Aoko Nakamori"). It's never confirmed whether it's supposed to be a younger version of her too or if it's just a case of similiar looking character designs, though.
## Adaptations[[edit](/wiki/index.php?title=What%27s_%22School%22%3F&action=edit&section=14 "Edit section: Adaptations")]
Main article: [Kenyuu Densetsu Yaiba](/wiki/Kenyuu_Densetsu_Yaiba "Kenyuu Densetsu Yaiba")
* **Episode 1:** [Heisei's Samurai Yaiba Appears](/wiki/Heisei%27s_Samurai_Yaiba_Appears "Heisei's Samurai Yaiba Appears")