Mina, who was involved in an event that caused her to have amnesia 3 years ago, met the boy from another section named Chou Tzuyu in a school-event race. The day after that night, Mina noticed something is wrong with her body after she woke up, she found that shes inside the body of Tzuyu. They seem to be stuck on each others body. The reason? Maybe the drink she offered him. Is this really their first connection or the boy has something to do with her past?