Credit Saison was founded in 1946 as Midoriya (緑屋) by Torajiro Okamoto.

It was originally an operator of department stores specialized in installment selling.

Following the collapse of the Japanese asset price bubble in the 1990s, Saison Group fell into financial difficulties.

The group's longtime president Seiji Tsutsumi was expelled from management in 1991.

Credit Saison issues credit cards Saison Card (セゾンカード, Sezon Kādo) branded Visa, Mastercard, JCB, or American Express.