Lustful Shogun and His 21 Mistresses

エロ将軍と二十一人の愛妾

Also known as Ero shogun to nijuichi nin no aisho, The Lustful Shogun and His 21 Concubines, 에로 쇼군과 21명의 애첩

The Tokugawa new Shogun is not interested in women. A nobleman with the help of a lady thief replaces the Shogun with a double, while he learns about love. But the double finds pleasure not only in women, but in his new status.