I Found her is the 16th episode of the D.N.Angel anime.
In this episode, Riku revisits her childhood memories after finding an old teddy-bear, a present from her grandmother, in her closet. Dark goes to steal a piece from the "haunted" Old Clover Mansion... which is where Riku lost her teddy-bear when she was younger. Riku remembers a young boy who had retrieved the toy from the mansion to give it back to her, and figures out later that it was in fact Daisuke. Risa also discovers a secret close to Dark's heart.