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![](https://pic1.mangapicgallery.com/r/avatar/a4/u130921_50x50.jpg?2)
http://www.mangago.zone/read-manga/kabe_no_naka_no_tenshi/
This is the only thing that comes to mind when I think about writer seme/train/uke unable to read, but he does learn how to in this one.
Perhaps there are more details your remember ?
All i can remember is that the seme and uke get on the train together in the end. The seme is a writer. In the end you find out the uke did not know how to read. the uke's roomate was Bun i think. i could be wrong. please help me find it