Problem Children are Coming from Another World, aren't they?
(Japanese: 問題児たちが異世界から来るそうですよ? Romanji: Mondaiji-tachi ga Isekai Kara Kuru Sō Desu yo?), also known as Mondaiji (問題児), is a Japanese light novel series written by Tarō Tatsunoko and illustrated by Yū Amano. An anime adaptation by Diomedéa aired from January 11, 2013 to March 15, 2013.

A sequel to Mondaiji titled Last Embryo began serialization on June 1, 2015 with a new illustrator, Momoko.

A sequel to both Mondaiji and Last Embryo titled Million Crown is planned to begin serialization on October 1st, 2017 with new illustrator, Kougeti.


Sakamaki Izayoi, Kudou Asuka, and Kasukabe Yō have tremendous powers and are bored with the regular world. An envelope arrives for each person, and when each opens their envelope, they are stunned to see the scenery around them change to a world they had never encountered before. They've been summoned by Kuro Usagi to help the community "No Name" to overthrow the Demon lords.




  • Jin Russell
  • Shiroyasha
  • Leticia Draculea
  • Lily
  • Calico Cat

Last Embryo

Million Crown

  • Shinonome Kazuma
  • Natsuki Kayahara
  • Chihiro Amanomiya
  • Hibiki Hitsugaya
  • Fubuki Hitsugaya

Light Novels

Part 1

The series is published by Japanese Publishes Sneaker Bunko. Currently the series is being translated by fan translation group Baka Tsuki. The series can be read here. Give credit to the translators!

Vol Title Translation Japanese Release Date ISBN
1 問題児たちが異世界から来るそうですよ? YES! ウサギが呼びました! Volume 1 -

Yes! Kuro Usagi called you!

March 31, 2011 ISBN 978-4-04-474839-5
2 問題児たちが異世界から来るそうですよ? あら、魔王襲来のお知らせ? Volume 2 - Oh dear, a Declaration of War by a Demon Lord? June 30, 2011 ISBN 978-4-04-474848-7
3 問題児たちが異世界から来るそうですよ? そう……巨龍召喚 Volume 3 -

I see... Dragon summoning

October 29, 2011 ISBN 978-4-04-474854-8
4 問題児たちが異世界から来るそうですよ? 十三番目の太陽を撃て Volume 4 -

Defeat the 13th Sun

February 29, 2012 ISBN 978-4-04-100182-0
5 問題児たちが異世界から来るそうですよ? 降臨、蒼海の覇者 Volume 5 -

Supreme Ruler of the Blue Waters Descends

June 30, 2012 ISBN 978-4-04-100357-2
6 問題児たちが異世界から来るそうですよ? ウロボロスの連盟旗 Volume 6 -

Flag of the Ouroboros Alliance

November 30, 2012 ISBN 978-4-04-100585-9
7 問題児たちが異世界から来るそうですよ? 落陽、そして墜月 Volume 7 -

Setting Sun and Falling Moon

April 1, 2013 ISBN 978-4-04-100759-4
8 問題児たちが異世界から来るそうですよ? 暴虐の三頭龍 Volume 8 -

Tyranny of the Three Headed Dragon

August 1, 2013 ISBN 978-4-04-100936-9
9 問題児たちが異世界から来るそうですよ? YES! 箱庭の日常ですっ! Volume 9 -

Yes! Everyday life in Little Garden

November 1, 2013 ISBN 978-4-04-101060-0
10 問題児たちが異世界から来るそうですよ? そして、兎は煉獄へ Volume 10 -

Then, Rabbit Heads Towards Purgatory

April 1, 2014 ISBN 978-4-04-101295-6
11 問題児たちが異世界から来るそうですよ? 撃て、星の光より速く! Volume 11 -

Strike Faster Than Starlight!

August 1, 2014 ISBN 978-4-04-102006-7
12 問題児たちが異世界から来るそうですよ? 軍神の進路相談です! Volume 12 -

It's a War God's Career Consultation!

April 1, 2015 ISBN 978-4-04-102006-7

Part 2

Last Embryo is the sequel/part 2 of Mondaiji tachi ga isekai kara kuru sou desu yo? The series remains published by Sneaker Bunko with the same author but a new illustrator, Momoko

Title Translation Japanese Release Date ISBN
ラストエンブリオ 1 - 問題児の帰還 Last Embryo Volume 1 -

Return of the problem child!

June 1, 2015 ISBN 978-4-04-101060-0
ラストエンブリオ 2 - 再臨のアヴァターラ

Last Embryo Volume 2 -

Second Coming of Avatara

December 1, 2015
ラストエンブリオ 3 暴走、精霊列車!

Last Embryo Volume 3 -

Berserk, Fairy Express!

May 1, 2016

Short Story (Not in Volume Format)

Title Translation Japanese Release Date Time Placement
吸血鬼メイドと詩人の話 前編 The Story Between the Vampire Maid and the Poet

Part 1: October 27, 2014

Part 2: November 25, 2014

Part 3: December 26, 2014

After Volume 11
トラブル・ファイルPart.1 Trouble File Part.1 January 26, 2015 After Volume 11
トラブル・ファイルPart.2 Trouble File Part.2 2015 After Volume 11
Shiroyasha Farewell Party After Volume 5


A television anime adaptation produced by Diomedéa aired on Tokyo MX from January 11, 2013 to March 15, 2013, and later on other stations. The series was simulcast by Crunchyroll and Anime on Demand. The opening theme is "Black † White" by Iori Nomizu whilst the ending theme is "To Be Continued?" by Kaori Sadohara. The anime adaptation tells the adventures of volumes 1 and 2. The OVA was released as a bundle/special with the release of Volume 8 of the Light Novel series. There were five releases in total with each disc containing two episodes.

Episode Title Japanese Release Date End Card
1 "Problem Children are Coming from Another World, Aren't They?"
"Mondaiji-tachi ga Hakoniwa ni Yattekita yō desu yo?" (問題児たちが箱庭にやって来たようですよ?)
January 12, 2013 Noizi Ito
2 "Seems Like a Crazy Loli Clad in Japanese Clothing?"
"Wasō Rori wa Iroiro Buttonda Okata no yō desu yo?" (和装ロリはいろいろブっ飛んだお方のようですよ?)
January 19, 2013 mebae
3 "Sounds Like We're Doing All Sorts of Stuff in the Bath Together?"
"Ofuro de Anna Koto ya Konna Koto da sō desu yo?" (お風呂であんなコトやこんなコトだそうですよ?)
January 26, 2013 Ruroo
4 "It Seems Some Pervert is After Black Rabbit?"
"Kuro Usagi ga Eroiyarashii Yatsu ni Nerawareta yō desu yo?" (黒ウサギがエロイヤらしい奴に狙われたようですよ?)
February 2, 2013 Fujima Takuya
5 "The Oath Seems to be Beyond the Stars?"
"Chikai wa Hoshi no Kanata ni da sō desu yo?" (誓いは星の彼方にだそうですよ?)
February 9, 2013 Thores Shibamoto
6 "Looks Like the Problem Children are Participating in a Festival?"
"Mondaijii-tachi ga Omatsurisawagi ni Sanka suru yō desu yo?" (問題児たちがお祭り騒ぎに参加するようですよ?)
February 16, 2013
7 "Someone Might Get All Kissy with Asuka in the Dark?"
"Kurayami de Asuka ga chūchū sa re chau sōdesu yo" (暗闇で飛鳥がチューチューされちゃうそうですよ?)
February 23, 2013
8 "It Seems That a Great Disaster Will Come With the Playing of a Flute?"
"Kuroi kyōji wa fue no oto to tomoni kuru sōdesu yo?" (黒い凶事は笛の音と共に来るそうですよ?)
March 2, 2013 BUNBUN
9 "It Seems That the Smell of Death That Brings About Disaster Is Growing Throughout the Town?"
"Saika o motarasu shi no kaori ga machi ni habikoru yōdesu yo?" (災禍をもたらす死の香りが街にはびこるようですよ?)
March 9, 2013
10 "It Seems That the Problem Children Prove Who's on Top?"
"Mondaiji-tachi ga shirokuro hakkiri sa seru yōdesu yo?" (問題児たちが白黒はっきりさせるようですよ?)
March 15, 2013
OVA "Problem Children are Coming from Another World, Aren't They? ~The Hot Spring Fun Trip~"
"Mondaiji-tachi ga Isekai kara Kuru Sou Desu yo? Onsen Manyuuki" (問題児たちが異世界から来るそうですよ? ~温泉遊記~)
July 20, 2013



Mondaiji-tachi ga isekai kara kuru sou desu yo? is a Seinen manga series that began serialization in Monthly Comp Ace with Nanamomo Rio as the illustrator. Covering volumes 1 and 2 of the Light Novels and ran alongside the anime, though outlasting it as the eighteen chapters were released once a month. The manga is more faithful tothe light novel and has scenes the anime does not.

Volumes Japanese Release Date ISBN
Volume 1 December 6, 2012 ISBN 978-4-04-120524-2
Volume 2 March 7, 2013 ISBN 978-4-04-120632-4
Volume 3 August 21, 2013 ISBN 978-4-04-120833-5
Volume 4 February 26, 2014 ISBN 978-4-04-120947-9

Spin-off Manga

Mondaiji-tachi ga Isekai Kara Kuru Sō Desu yo? Z is a Shonen spin off manga written and illustrated by Anri Sakano. It ran in Age Premium during the run of the anime and after it. Volumes 1 and 2 take place after the events of Volume 2 of the Light Novel while Volume 3 takes place after volume 5.

Volumes Japanese Release Date ISBN
Volume 1 January 7, 2013 ISBN 978-4047128484
Volume 2 May 9, 2013 ISBN 978-4041206324
Volume 3 January 9, 2014 ISBN 978-4047129931


Type Title Episodes Artist Album
Opening Black+White 2-10, OVA Nomizu Iori Black † White
Ending To Be Continued? 2-9, OVA Sadohara Kaori To Be Continued?
Ending Song #2 Our Constellation 10 Sadohara Kaori
Insert Song Beauty as the Beast 1, 5 Kaori Sadohara featuring Yamagata Yukio To Be Continued?
Insert Song Scarlet 9 Sarah Emi Bridcutt (VA: Kudou Asuka) Sound Community II
Insert Song Unknwon World 9-10 Asanuma Shintarou (VA: Sakamaki Izayoi) Sound Community II
Insert Song SINCERELY OVA Nakajima Megumi (VA: Kasukabe You) Sound Community I
OST Sound Community I 1-10, OVA Hamaguchi Shirou, Nomizu Iori & Nakajima Megumi Sound Community I
OST Sound Community II 1-10, OVA Hamaguchi Shirou, Sadohara Kaori, Sarah Emi Bridcut & Asanuma Shintarou Sound Community II


Drama CD's

Mondaiji tachi ga Isekai kara Kuru soudesuyo? Drama CD "Kore ga No Name no Nichijou no youdesuyo?"

Mondaiji tachi ga Isekai kara Kuru soudesuyo? Drama CD "Kore ga No Name no Nichijou no youdesuyo?" Vol.2

Mondaiji tachi ga Isekai kara Kuru soudesuyo? Drama CD "Kore ga No Name no Nichijou no youdesuyo?" Vol.3

Mondaiji tachi ga Isekai kara Kuru soudesuyo? Drama CD "Candle to Omelette to Ghost Town Zenpen"

Mondaiji tachi ga Isekai kara Kuru soudesuyo? Drama CD "Candle to Omelette to Ghost Town Kouhen"

Mondaiji tachi ga Isekai kara Kuru soudesuyo? Oretachi ga Saikyou da BD-BOX Drama CD




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