Tenshi Goku's Links
They met somewhere before, but don't really recall after the game started. In the first game, a shutter sound came from under the dinner table and that's where Tenshi met Dennis (or rather the other's shoes) for the first time. Tenshi stays hidden for most of the time, so it's nice to have a "friend" in the game too.
At first, Dennis was unsure what to think of someone taking pictures of people's feet under the table. But that interaction enabled him to be curious enough wanting to know more about this shy photographer.