Kyou kara Ore wa!!

This anime is about two students who are tired of being normal and unpopular at their old schools, after they both transfer to a new one they try to change that by deciding to become delinquents. After a rough start they become friends and the righteous Itou with the cheater Takashi start their (dis)adventures trying to survive the other delinquents from both their own and other schools.

Shounan Junai Gumi!

Eikichi Onizuka and Ryuji Danma are members of infamous biker duo, the Oni Baku. When not out riding around, they can be found in school, trying to pick up young women. This is the story of the young Onizuka, who would later become the greatest teacher in Japan, and his partner Ryuji in their quest to lose their virginity and reach maturity. They are widely feared bosozoku, and are known for their tenacity and viciousness in a fight. However, this lifestyle does not exactly endear them to the opposite gender, so they decide to change their ways. However, this is easier said than done. (Source: Anime News Network)

Otoko Ippiki Gaki Daishou

TV anime adaptation of Motomiya Hiroshi's manga "Otoko Ippiki Gaki Daishou" about young gang leader and all the trouble and fights his gang gets into, serialized in Weekly Shonen Jump. (Source: AniDB)

Tokyo Revengers

Takemichi Hanagaki is a freelancer that's reached the absolute pits of despair in his life. He finds out that the only girlfriend he ever had in his life that he dated in middle school, Hinata Tachibana, had been killed by the ruthless Tokyo Manji Gang. The day after hearing about her death, he's standing on the station platform and ends up being pushed over onto the tracks by a herd of people. He closes his eyes thinking he's about to die, but when he opens his eyes back up, he somehow had gone back in time 12 years. Now that he's back living the best days of his life, Takemichi decides to get revenge on his life by saving his girlfriend and changing himself that he'd been running away from. (Source: Crunchyroll)