"I'm a little surprised to see that it gained such popularity, especially among women in their 40s," Kida said.
"They treat their Primopuels as if they were raising their own five-year-old children," she said.
But there are some fervent male fans as well.
"I have more than 10 [Primopuels] at home," said company employee Koshimoto.
"I'm too embarrassed to talk about it [Primopuel] at my company. So it's nice to have a gathering like this, where I can meet other fans," he said, adding that he had taken a day off work to attend the gathering.
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