Shuukan Shounen Girl  

Weekly Shounen Girl, Weekly Shonen Girl, 週刊少年ガール

Each chapter of this manga introduces a new female character. In the first chapter, Ichikawa discovers she has a shounen manga appearing on her torso every week, which she shares with her male classmate and fellow manga fan, Aoi. Meanwhile, Kawamura notices that a boy in her class is being duplicated.