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."