-rain-

-rain- is a one-shot manga series by Hashiba Hayase.

Plot
"Because I love you."

On a rainy day, when Mai got stood up by the guy she likes she met a beautiful girl who told her that she was the Rain and that she had come because of her tears. After that Mai's days were filled with the bitterness of betrayal, only the memory of the girl called Rain can somehow ease her heart. A story of a brief love affair under the rainy season.

Other Sources
MyAnimeList