Miyazaki Prefecture's satsumaimo, or sweet potatoes, are selling fast in other parts of Asia thanks to Makoto Ikeda, the CEO of Kushima AoiFarm. Since he started this company with a staff of 4 family members in 2013, exports have been booming. Now the firm has 68 employees and annual sales of 700 million yen. Interestingly, the type of sweet potato that is popular in Hong Kong, Singapore and Taiwan doesn't sell so well in Japan. We explore what Ikeda has done to achieve sweet potato success.