One day, a strange customer who buys only one ball visits the pachinko parlor where Akane Saburo, commonly known as "Nail Master Sabuyan," works. The customer, Isshin Mikyu, a pachi-pro, calls Sabu-yan a good nail master, and shows off "Ninkyu-tama scissors" on a stand that Sabu-yan has tightened perfectly. Sabu-yan, who sees it with his own eyes and burns with a fighting spirit, finally finds a way to break the ball scissors, and puts up a gold bill of "Go to the Nailer" to challenge the game with all his heart...