 If you liked Monster |  ...then you might like Boku dake ga Inai Machi |
Both MCs are heroes and rescue people. Both MCs save a person from child abuse. This person develops a close relationship with the MCs. Dieter = Kayo in BokuMachi. Both MCs are framed for murder. Both MAs are highly intelligent and trick people's minds. Both get inspired from stories. (Monster Without A Name = Spider's Thread in BokuMachi). Both are mystery, psychological and seinen. Both are adapted into anime. While Monster primary takes place in Germany around 1986, BokuMachi primary takes place in Japan around 1988).
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