There was a drop of water in the dust that was retrieved from the asteroid.
There is support for the theory that life may have arisen from outer space.
The Hayabusa-2 probe collected 5.4 grammes of stones and dust from the asteroid.
The lead scientist told reporters before publication of the research that the drop of water has meaning.
Water was found in an asteroid for the first time, but many researchers think it came from outer space.
Two years ago, Hayabusa-2 returned to Earth after dropping off a capsule containing the sample.
Some of the building blocks of life on Earth may have been formed in space as a result of the precious cargo's discoveries.
A drop of fluid was found in the sample of water that was carbonated.
He said that it supports the idea that asteroids could have provided water, which contains salt and organic matter, in their collision with Earth.
Evidence points to the origin of the oceans or organic matter on Earth.
Thirty researchers from the US, Britain, France, Italy and China are part of the team that is analyzing the sample from Ryugu.
The sample has been divided into different teams to find new things.
A professor at Yokohama National University who is not part of the research group hailed the discovery.
He said that it was surprising that water was found in the sample, given its susceptibility to destruction in outer space.
It's possible that the asteroid contained water, in the form of fluid and not just ice, as well as organic matter.
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