白いレンガと黒い喪服 (Shiroi Renga to Kuroi Mofuku)

Background
A young orphan girl(Rin) walks past an antique shop and sees a mirror that reflects the face of a boy(Len) that she falls instantly in love with. She starts stopping by the shop every day to meet him but since she's so poor, she can't afford to buy the mirror, but they boy assures her that if she remain pure at heart he'll be with her forever. However when she becomes an adult, she never gains the mirror, believing that it's becuase she's become impure. However, after getting stuck in an unloving marriage, she gives birth to a boy and he grows up to share the same apeearence as the boy in the mirror.

This song was written for Triangle vol. 2.