Hi !I'm new to dramas but I began because I wanted to see some adaptations of mangas I like ^^ So do you know some dramas with delinquents, "furyos" style like Sugarless,Crows , Drop? Thanks !

Hello!
I haven't seen those you mentionned, but here are some J-dramas where some characters are described as delinquents (or yankees) :
Gokusen, Yankee-kun to Megane-chan, Tumbling, maybe Kisarazu Cat's eye, Yankee Bokou ni Kaeru SP.
Maybe they are too soft for your taste, and them being delinquent is not always the main topic of the show.
Thanks for your answer !