 If you liked
NON Tea Room
|
 ...then you might like
Koujitsusei no Tobira
|
Well, for one thing they have the same author/artist and both mangas are yaois with an interesting plot-line and beautifully drawings. Whereas "Koujitsusei no Tobira" is more action orientated, "Non Tea Rooms" first story is a slice of life and the other one is slightly science-fictional.
But both mangas are very sweet romance stories, and if you like one of them, it's very probable you like the other, too.