Incidents have been happening around the school, and it's up to the Student Council to resolve it before things get out of hands. The S.C President, Washimiya Hikari, has been entrusted with the task of cracking the code while all council members gather clues for her - however, due to her weak constitution, she is unable to leave her room and must solve cases remotely. Not only that, she is also good-for-nothing without her uniform, so the vice president, Kise Souta, has been entrusted with a secret mission shared between them: To help Hikari change her clothes whenever she needs to solve a case...