 If you liked
Tantei wa Mou, Shindeiru.
|
 ...then you might like
Spy Kyoushitsu
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Both animes are related to crimes and investigation but the difference is that the anime is talking about spies and the other is talking about detectives.
Plus, the helpers/the students of the leader MC in both animes are dealing with problems
Also, both animes can be considered as romance.