High school student sees popular and famous Mai Sakurajima dressed as a bunny girl in the library one day. That is odd in itself, but what makes it even stranger is that nobody else in the library seems to be able to see her except for Sakuta.
This incident we come to find out is just one occurrence of a phenomenon called puberty syndrome, where weird unexplained things happen to young people Sakuta is familiar with this as he has had his own past with the syndrome affecting him and his family directly.
There are strange phenomena that occur during this show, not limited to people vanishing from existence or sisters ending up in each other's body. It gets strange but its a very enjoyable, especially the relationship that buds from Mai and Sakuta, it is totally the cutest.
check out the trailer below, you can catch the show on Funimation, Crunchyroll, or Hulu.