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."