My best mistake was you

With Oga gone, Furuichi finds himself alone for the first time. He fills his time with studying and getting ready to transfer. With his nose stuck in a book, he doesn't notice the rumors that are flying. Rumors of how the great tactician of Mad Dog Oga is no longer at his side. Every delinquent who wants to be the next top dog is eyeing the tactician. And poor Furuichi has no idea