雨夢楼 (Ama Yume Rou)

Background
The fleeting words "I will go to meet you, please wait" Although the season has elapsed and cycled, we have become adults, I am still believing, and waiting―

A song about two courtesans in pre-moderen Japan that had made a promise to each other as children to be together forever. As they grew older they drifted apart, though one girl (Rin) still harbors romantic feelings for the other. The other girl (Miku) meets and falls in love with a man (Len), and though heartbroken, Rin decides to let her go and put Miku's happiness above her own, because she believes that Len's love will make Miku happy. Len promises to buy Miku and asks her to wait for him, but he never returns and Miku dies of disease.

The song was featured in the albums STORIA, 花楽里漫葉集 feat.初音ミク, EndlessroLL, and Tenkyou-no-wagaku (天響ノ和樂).