Sales education is still an important issue even today with the evolution of various technologies such as AI and chatbots. Although there is a lot of research in this field, it is extremely difficult to transfer the mindset and skills of successful salespeople to actual sales learners because each person's personality is different. This paper presents a case study of the sales practice and education of a "OSEKKAI" entrepreneur whose company she founded went public on the stock market. "OSEKKAI" is a Japanese word meaning to do what you can for the other person without worrying too much about his or her complexion. It is similar to kindness, but slightly different in nuance. The case study is analyzed against the effectuation theory of thinking styles of outstanding entrepreneurs, suggesting the possibility of a highly reproducible sales education method.