The most likely reference is the Jōmon Venus , a famous ancient clay figurine from Japan. It’s a National Treasure discovered in Chino, Nagano, and dates to the Middle Jōmon period, around 2500 BC.
What it is
The Jōmon Venus is a female dogū statue made of clay, standing about 27 cm tall and weighing 2.14 kg. Its name comes from its Venus-like feminine form, with broad hips, breasts, and a rounded belly.
Why it matters
It’s notable because it was the first Jōmon-period artifact ever designated a National Treasure in Japan. Unlike most dogū found in Japan, this one is complete rather than broken.
Another possible meaning
If you meant “Venus” in a different context, Japan also has Akatsuki , its Venus-orbit spacecraft mission, which studied the planet Venus from orbit.