 If you liked Meitantei Conan |  ...then you might like Matantei Loki Ragnarok |
Both series deal about grown-up characters turn into little kids. Both Loki and Conan, work as detectives since they have the minds of adults. The major difference is that the first is a demon god while the latter is a high school student.
Both have teen boys that were turned into kids and become detectives to find out what happened
report Recommended by Animeluvr3