General Motors Co. has also begun to offer models with the steering wheel on the right, which is standard in Japan.
"We have just begun our fight," Ishii told reporters at the Foreign Correspondents Club in Tokyo. "We offer attractive qualities that you can't find in Japanese and European cars."
Ishii and Gregg Sedewitz, director of sales and marketing, said the cars represent American luxury and are synonymous with risk taking, coolness and Hollywood celebrities.
The Cadillac CTS comes packed with the latest technology, such as a lightweight structure and a direct injection turbo engine, and sells for 5.99 million yen ($59,900) and 6.99 million yen ($69,900).
The Corvette, which ranges from 9.29 million yen ($92,900) to 11.59 million yen ($115,900) including the convertible models, is the greenest Corvette ever, delivering 12.3 kilometers per liter.
They go on sale in Japan from April and May next year.
Japanese consumers have historically favored European imports and home-made cars over American models, including luxury brands.
Annual sales of the Lexus, the luxury offering from Toyota Motor Corp., the world's top automaker, total about 40,000 vehicles in Japan. Annual sales for the BMW are about that same number.
Sedewitz acknowledged there was "no magic bullet" to boost sales volume in Japan.
"The numbers speak for themselves," he said. "We are in it for the long term."
-AP