The research purpose was to understand the current situation of consumer education for mentally challenged students and issues for developing lesson materials. Focus group interviews were conducted with five home economics teachers who agreed to participate in interviews and had experience of teaching high school home economics in prefecture A. As results, it was found that the participant teachers were instructing students on how to use electronic money after the students understood that their total money is reduced using cash or cash cards. The teachers also talked about not only current senior high school students, but even junior high school students and graduates who had troubles with charging money in online games. Based on their talks, it was revealed that it is necessary to develop an online simulated game for instructing a cash flow and decision making in-game billing with a failure experience.