Rascal Does Not Dream of Siscon Idol (light novel)

Sakuta had been waiting excitedly for a chance to spend time with Maiagain, but instead he's greeted by a stranger who looks just like her.Apparently, Adolescence Syndrome has forced her to swap bodies with NodokaToyohama, a flashy up-andcoming idol...who also happens to be Mai's sister froma different mother! Now, forced to pretend to be the other, the sisters go abouttheir respective lives as best they can but it seems like Nodoka is preoccupiedwith something besides walking in Mai's shoes...