Ep. 9: Sakuta discovers Mai has swapped bodies with her half-sister Nodoka Toyohama.

9

The new school term begins, but Sakuta cannot find Mai because her agency forbids public dates. He spots her on the street and realizes she has swapped bodies with Nodoka Toyohama, an idol and Mai's younger half-sister. As they adjust to their new lives, Sakuta learns the siblings hold a grudge against each other due to parental expectations. Nodoka resents living in her older sister's shadow. During a video shoot, Nodoka collapses because the routine act is too overwhelming for her. Later, Mai gives Sakuta the key to her house and orders him not to open a specific cabinet. At Mai's house, Sakuta comments on Nodoka's effort. While she is bathing, he approaches the forbidden cabinet.