Well, this time not TG, but LGBT. I was feeling a little nostalgic so I want through my manga/yuri library and found almost forgoten jewel: yuri manga Pieta by Haruno Nanae. It ´s psychological manga about loneliness and finding your way. It ´s great, touching, and also tough. So make sure you have tissues handy! For those who want always more, there is loose continuation name Double House, also to be found on http://www.lililicious.net Online version for reading can be found here: http://www.mangahere.com/manga/pieta/ Here is little teaser:

A little story description from pages:
ShÅ«ichi Nitori is a 5th grade student who likes to bake and has always been something of a feminine boy. When he transfers to a new school, ShÅ«ichi is mistaken for his 6th grade sister on his first day. Then he ends up sitting next to Yoshino Takatsuki, a tall, boyish girl who everyone calls “Takatsuki-kun.” They both have secrets they can’t let anyone know…

It is very nice story and I think you should try it.
Enjoy