After a no-dating rule is imposed by her management, Mai is too busy with work to spend any time with Sakuta. As he excitedly welcomes the start of the second trimester and the opportunity to see Mai at school, Sakuta is shocked to be asked “who are you?” when he runs into Mai in front of his house. Upon looking into the situation, he discovers that Mai and her little sister, Nodoka Toyohama, have switched bodies. Until they can resolve this case of the “Puberty Syndrome,” Mai must spend her days as Nodoka and Nodaka must spend her days as Mai…
