 If you liked
Mouryou no Hako
|
 ...then you might like
Bishounen Tanteidan
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Both are about of bishounen detectives solving mysteries with unusual solutions. Both series are quite heavily in dialogue and make use of the supernatural powers one of their members have (Reijirou and Mayumi sharing supernatural vision, for example).
Now let me note that Mouryou no Hako is more grim and adult compared to the cheery and colorful Bishounen Tanteidan (The first being Seinen and the second Shoujo-ish), but fans of detective stories will surely enjoy both.