The 12th installment of the pachinko simulator series by Sanyo Bussan, a pachinko manufacturer in partnership with Irem Software Engineering. The series features pachinko machines produced by Sanyo Bussan and is known by the abbreviated title "Pachipara," starting from this installment, transitioning from its previous title, "Sanyo Pachinko Paradise."

The featured pachinko machine in this installment is "Daikai Monogatari" (The Tale of the Great Sea). Additionally, the familiar story mode, "Pachipro Fūunroku" (Pachinko Professional Chronicles), is included as the fourth installment titled "Pachipro Fūunroku 4: The Silver Ball Murder Case." The Pachipro Fūunroku series has been included since "Pachipara 8" and is characterized by elements of gal games and oddly serious storytelling (with some absurd game elements) despite being a pachinko game.

While the previous three installments had a top-down view, this installment showcases an expanded potential for the game as it adopts the same game engine as "Ponkotsu Roman Daikatsugeki Bumpy Trot," a game developed and released by the same company.

It was the Showa era, a time when those who couldn't keep up with the waves of change were left behind, and the era was rapidly transforming.

The protagonist, traveling across the country in pursuit of their training as a pachinko professional, happened to visit a pachinko parlor in "Pachipara Town" on a rainy morning.

Although they had casually dropped by, inside the shop, they found a man and a woman lying on the floor, covered in blood. The man was already dead, while the woman had fainted.

Accused of being the murderer by the store manager who appeared on the scene, the protagonist was framed and embarked on an investigation to clear their own name.

However, as if one mystery led to another, the tragedy repeated itself...