Kamen Tantei

Kamen Tantei (仮面探偵, lit. "Masked Detective") is a manga series by Matsuri Akino that was published by Akita Shoten and licensed by Tokyopop.

Plot
A pair of young aspiring mystery writers have weird incidents happen around them that need solving. Luckily for them, the Masked Detective inexplicably always shows up to help.