Tenshi Kinryouku, The Other Side of the Mirror Recommendations
if you liked The Other Side of the Mirror, you will love Angel Sanctuary. TOSOTM is a lot like Kaori Yuki's work. AS and TOSOTM share the dramatic story of pure love between a cheerful girl with dark past and her equally trouled, moody lover.
Chen Jo and Kaori Yuki have really similar drawing style.
The main difference is that Angel Sanctuary has a supernatural plot, while The Other Side of the Mirror is realistic. They're both dark and romantic!
Another difference is lenght - AS has 20 volumes, while TOSOTM has only 2.