An elementary student takes a red backpack to school one day simple believing it to be pretty, until she realised the colour was gender specific and coded as male, beginning a sense of disharmony. The protagonist of this documentary is diagnosed with gender dysphoria at age 14, and based this diagnosis she wins an appeal for her middle school to accept her as a male student by the name of Takamasa. The film then follows Takamasa for 3000 days as he attempts to find and build his own identity.