少年探偵 is a 6-book series with 6 primary works first released in 1936 with contributions by 江戸川 乱歩 and Edogawa Rampo.
1936 • 1 Reader • 198 pages
1936 • 1 Reader • 253 pages • 5
1937 • 2 Readers • 255 pages • 3.5
1964 • 1 Reader • 307 pages • 4
1964 • 1 Reader • 249 pages • 3
1964 • 1 Reader • 190 pages • 4
2019 • 1 Reader • 138 pages