Japan's obsession with robots isn't just a cliche. Companies have been trying to drum up enthusiasm for them for years, with little success.

Pepper, a humanoid machine carrying the hopes of SoftBank Group Corp.'s billionaire founder Masayoshi Son, was supposed to change that. Promoted as the first robot to be endowed with emotions, the company marketed Pepper aggressively after it was unveiled in 2014, promising the gadget was sophisticated enough for tasks usually handled by shop clerks, receptionists and translators.

"It's not there to have a conversation," said Junichi Nishi, a municipal official in Fujieda, Shizuoka Prefecture, a city of about 140,000. "We use it primarily as a tablet," he said, referring to the touch screen attached to the robot's chest.