Which doujin manga have you read that was able to tell its own story while following canon?

[nightsedge561]

There obviously are a lot of fan manga out there, but which ones do you believe follow closely enough that you would almost consider them canon? the only one i can think of off the top of my head would be The gensokyo of Humans, a manga following Hieda no Akyuu and Kosuzuu Motoori as Akyuu seemingly approaches her death. With a description like that you wouldnt think so but it does a surprisingly good job. any other ones you have that you would almost consider canon?