Tadashi Saito imagines his son leaving the office after a long day at work and trudging home to a lonely bachelor's apartment with all the lights out and no hot food on the table.

So instead of waiting for his son to find the woman of his dreams and settle down, Saito is making the first move by joining the latest fad in the nation's lucrative marriage market: attending a lonely-heart parent convention.

"When I imagine my son going home with nobody waiting for him, I feel sorry for him," said Saito as he handed out photos of his 33-year-old son to parents with eligible daughters at a recent gathering in Tokyo organized by the Office Ann marriage agency.