Chubou Desu yo! Osaka Yancha Memory

From MangaHelpers:
Sappi, who has enormous ears, is just starting his middle school years at a school known for its delinquents. He has his tougher friends, Ryuuji and Kame, to look after him, and he has a big crush on a girl named Sara, who he had admired from afar in elementary school. After Sappi has the first fight of his life, he and his friends are recruited into the gangs of their school. Their delinquent-filled middle school life has just begun!