 If you liked
Sanctuary
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 ...then you might like
Ouroboros: Keisatsu wo Sabaku wa Ware ni Ari
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Similar premise. Both have childhood friends who went to different fields in order to change society. One became a yakuza while the other worked for the government/authorities. The two friends are still in communication but they hide their relationship from public to avoid suspicion.
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Recommended by xxxholic_wing