No one in the library seems to notice Mai Sakurajima's bunny girl costume—or Mai herself. Sakuta Azusagawa does, and when he approaches her, he discovers that the famous third-year student is suffering from Puberty Syndrome. Once a child actress, Mai recently stepped away from her promising career without publicly explaining why. At school, she remains widely recognized but unapproachable.
For Sakuta, her strange predicament is no reason to doubt her. His own experiences have already convinced him that Puberty Syndrome is real, despite its reputation as a myth. Affecting only teenagers, the condition produces supernatural symptoms that few people accept as genuine. Sakuta knows it is also surprisingly common at his school. His efforts to help Mai lead him to other girls experiencing the elusive condition.
