Honey and Clover

Mayama dreamed of Rika-san. His co-worker said when one dreamed of another, that was because the person in the dream wanted them to meet so much that the soul escaped the body and came to the dream. Mayama was doubt about that but on the way came back from a conference, he and his co-workers passed a park where Rika-san was just behind a fountain watching him passing by. Mayama didn't notice until later on. But when he ran back to the fountain, she was not there anymore.