Sakai Hiroki is the right-hand man of pachinko parlor owner Tsumura Kenzo. One day, Tsumura mysteriously disappears, leaving Hiroki plus Tsumura’s daughter Rie to figure out what happened. Then Hiroki ‘encounters’ a gangster seeking a certain mysterious envelope. The Yakuza put on the pressure, but Hiroki fights back with both his fists and his brains.