This article is to consider new working styles after corona era by observing the actions taken by start-up company A in response to the spread of new coronavirus infection with data such as the office attendance status of employees working there. At Company A, the office attendance rate was low at the beginning when all employees were instructed to telework in principle in response to the state of emergency issued by the government, but after that, it gradually became under the control of the company. Although it rose, as a result of canceling company-wide unified control and leaving office attendance to the judgment of the department, the attendance rate was only about 25%, which is the current ratio of telework considered as the best work location mix by business side.