Saint Ishiyama Academy Arc

The third story arc in the series, the Saint Ishiyama Academy arc is comprised of Chapters 48-76 in the Manga and Episodes 25-36 in the Anime. This arc details on how the delinquents of Ishiyama High are being transferred to their sister school, Saint Ishiyama Academy, as well as the introduction of the Rokkisei. This arc is also the first to give major glimpses of Oga's and Furuichi's past, mainly from when they were in middle school.

Synopsis
Spoiler warning: Plot and/or ending details follow.