Recent discoveries have revealed exoplanets orbiting young Sun-like stars, offering a window into the early solar system. The young stars are known to produce extreme magnetic explosions, called superflares, about once a day, potentially triggering fast and massive coronal mass ejections (CMEs). Recent studies suggest such ejections could induce atmospheric loss and chemical reactions in early exoplanet atmospheres. However, the association of CMEs with superflares is still unexplored. Here we present the results of 5-years multi-wavelength observations of young Sun-like stars, providing the critical clues to the common picture of solar and stellar CMEs. First, through optical spectroscopic observations, we found four of eleven superflares are associated with fast prominence eruptions, precursors to CMEs. The stellar data greatly resemble solar counterparts, indicating a common picture of solar/stellar eruptions. Second, one of the eruptions is associated with potential coronal dimming in X-rays, indicating that the prominence eruptions evolved into stellar CMEs propagating through interplanetary space. Furthermore, the extension of solar MHD model supports the above indication and suggests that the eruption originates from the observed magnetic active region. This comprehensive study suggests that further advancing the use of solar model could provide the first empirical inputs into calculations of atmospheric escape and chemical reactions for young planets.