Nishii had worked for some e-commerce companies for more 10 years. During the career, he launched a mobile EC bussines and worked on direct marketing. At the end of 2013, he became self-employed. Working as a e-commerce consultant for several majar e-commerce companies, he traveled abroad and return home in June 2014. he wote 3 books of travelogue based on his travel from 2001 to 2003. he became CEO of warmth Co., Ltd. and CMO of oisix Co., Ltd in July 2014.