1. At the end of Hourou Musuko, it was basically revealed that ‘Hourou Musuko’ is the autobiographical story written by a 17 year old Nitori about her late childhood and teenage years.
2. Her story both closes with the words, and begins with the opening chapter title; 'I am a Girl’.
3. Nitori subtlety but deliberately ascertains the fact that she is a girl both at the start and the end of her story.
4. Please stop claiming that Nitori is really just a 'feminine, cross-dressing gay boy’. There really is no excuse by this point. I think Takako Shimura has concluded the manga making it quite clear what gender Nitori is.