The Mitsubishi eK is a kei car series from Mitsubishi Motors, based on the long-running Minica, and first introduced on October 11, 2001. According to the company, the "eK" name stands for "excellent keijidōsha" or "excellent minicar".

Nissan Motor Co. Ltd. is a Japanese multinational automobile manufacturer headquartered in Yokohama, Kanagawa, Japan. The company sells its vehicles under the Nissan and Infiniti brands, and formerly the Datsun brand, with in-house performance tuning products under the Nismo and Autech brands. The company traces back to the beginnings of the 20th century, with the Nissan zaibatsu, now called Nissan Group.