Kowarekake no Orgel

The story centers around Keiichirou, a young man who lives alone in his house. He went through a lot of pain in his life, ever since an accident that happened three years ago. One rainy day, he finds a little girl, drenched from the rain, inside his home. She is named Flower, and so begins the life for these two unlikely protagonists. (Source: MangaFox)