This is the second iteration of the Mugen Shinshi franchise and is generally referred to as Mugen Shinshi Bouken Katsugeki-hen.
 
Note: In 2007, volume 1 of Shinsouban Mugen Gaiden clarified the different versions of the story and iterations of the protagonist, Mamiya Mugen. This series was designated "Shounen tantei B version."

When a strange group of men attempt to kidnap Atsuko Fukune, a dancer at a club, she seeks the help of Mamiya Mugen, a famous detective - who also happens to be a child. When it turns out that other girls have gone missing, Mamiya, with the help of his butler Alucard, springs into action to solve the mystery.
 
(Source: Anime News Network)

This is the fifth iteration of the Mugen Shinshi franchise.
 
A guardian angel in black saves "me," who has inherited a huge inheritance, from a crisis. This collection contains a total of 12 stories serialized in Mystery Magazine.
 
(Source: Hayakawa Publishing, translated)
 
Included Stories: 
- 電波塔 
- 女か虎か 
- 木乃伊の恋 
- 瞬きよりも速く 
- Shall We Dance? 
- 暗くなるまで待って 
- 渚にて 
- 眠れる森の美女 
- 父、帰る 
- 影が行く 
- 長いお別れ 
- 君の名は
 
Note: In 2007, volume 1 of Shinsouban Mugen Gaiden clarified the different versions of the story and iterations of the protagonist, Mamiya Mugen. This series was designated "Seinen tantei C version."

This is the first iteration of the Mugen Shinshi franchise serialized in the magazine Manga Shounen. The first compiled volume contained a brand new picture story.
 
Mugen Shinshi follows the boy detective clad in black, Mamiya Mugen, through his many mysterious encounters out in the world.

 
1. Yuukitou no Kaijin (Picture story) (遊鬼塔の怪人（絵物語）) 
2. Kao Dorobou (顔泥棒) 
3. Tsukaima no Tsubo (使い魔の壷) 
4. Aokuchinawa Fujin (青蛇婦人) 
5. Mugen Shoujo (夢幻少女) 
6. Kakashi Tei (案山子亭) 
7. Ariko no Kan (亜里子の館) 
 
Note: In 2007, volume 1 of Shinsouban Mugen Gaiden clarified the different versions of the story and iterations of the protagonist, Mamiya Mugen. This series was designated "Shounen tantei A version."

In the third iteration of the Mugen Shinshi franchise we encounter an older and more serious version of the young detective Mamiya Mugen. 
 

Volume 1: 
1. Yuureisen (幽霊船) 
2. Roufuufu (老夫婦) 
3. Kyuuketsuki (吸血鬼) 
4. Numa (沼) 
5. Yuurei Fujin (幽霊夫人) 
6. Kubiyashiki (首屋敷) 
7. Harionago (針女) 

Volume 2: 
1. Mokusei (木精) 
2. Satori (サトリ) 
3. Muma (夢魔) 
4. Shoukouki (昇降機) 
5. Kumo (蜘蛛) 
6. Hanningyou (半人形) 

Volume 3: 
1. Hanabi (花火) 
2. Oni (鬼) 
3. Hebi (蛇) 
4. Yakai (夜会) 
5. Ningyou Jigoku (人形地獄) 
6. Tooi Michi (遠い道) 
7. Tora (虎) 

Note: In 2007, volume 1 of Shinsouban Mugen Gaiden clarified the different versions of the story and iterations of the protagonist, Mamiya Mugen. This series was designated "Seinen tantei A version."

This is the fourth iteration of the Mugen Shinshi franchise.
 
Note: In 2007, volume 1 of Shinsouban Mugen Gaiden clarified the different versions of the story and iterations of the protagonist, Mamiya Mugen. This series was designated "Seinen tantei B version."

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