Looks like a Gathering for future Yakuza.
Source: Shiritsu Kiwamemichi Kōkō aka Ultimate Path Private High School created by Akira Miyashita.
#ShiritsuKiwamemichiKoKo #UltimatePathPrivateHighSchool #私立極道高校 #AkiraMiyashita #宮下あきら #70sManga