He had moved last year to an abnormally low priced house that is on top of stairs. Ever since Tokyo’s first night of snow, the doorbell would ring every night, but all he could find were footprints leading to the entrance with no one in sight. As there were no footprints that showed that the person left, he thought it was the work of a ghost so sought Rinne.
The ghost is revealed to be a deceased delivery man who couldn't deliver the ordered pizzas to a previous owner of the house Dan lives in, and Dan had to sacrifice the money that was meant for the Sushi delivery to help the ghost pass on.
- His last name (高階) means "High Floor" which refers to the house he lives in that is on top of stairs.