 If you liked
Durarara!!x2 Ketsu
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 ...then you might like
Ikebukuro West Gate Park
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Both anime are about different gangs with charismatic leaders traversing the dark underworld in Ikebukuro which is a commercial and entertainment district located in the specialized Toshima Ward in Tokyo. Both anime also have a similar feel in terms of tensions and conflicts between rival gangs and between friendships as well.
Thanks for reading,
-Tooru25