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The objective of the Japanese mission Hayabusa-2 was to study and return a sample of a Class C asteroid, "Ryugu". These asteroids are the parent bodies of carbonaceous chondrites, primitive meteorites containing a large fraction of organic matter (up to a few percent). Their study allows us to better understand the planetary formation processes and more generally to have access to the first millions of years of the Solar System, or even before with the possible presence of pre-solar grains. Their composition, rich in organic matter, is also particularly interesting to study in order to better constrain the scenarios of formation and evolution of organic matter in the Solar System.