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We conducted the time-resolved simultaneous optical spectroscopic andphotometric observations of mid M dwarf flare stars YZ CMi, EV Lac, and AD Leo.Spectroscopic observations were obtained using Apache Point Observatory 3.5mand Small \& Moderate Aperture Research Telescope System 1.5m telescopes during31 nights. Among the 41 detected flares, seven flares showed clear blue wingasymmetries in the H$\alpha$ line, with various correspondences in flareproperties. The duration of the blue wing asymmetries range from 20 min to 2.5hours, including a flare showing the shift from blue to red wing asymmetry.Blue wing asymmetries can be observed during both white-light and candidate nonwhite-light flares. All of the seven flares showed blue wing asymmetries alsoin the H$\beta$ line, but there are large varieties on which otherchromospheric lines showed blue wing asymmetries. One among the 7 flares wasalso observed with soft X-ray spectroscopy, which enabled us to estimate theflare magnetic field and length of the flare loop. The line-of-sight velocitiesof the blue-shifted components range from -73 to -122 km s$^{-1}$. Assumingthat the blue-shifts were caused by prominence eruptions, the mass of upwardmoving plasma was estimated to be 10$^{15}$ -- 10$^{19}$ g, which are roughlyon the relation between flare energy and erupting mass expected from solarcoronal mass ejections (CMEs). Although further investigations are necessaryfor understanding the observed various properties, these possible prominenceeruptions on M-dwarfs could evolve into CMEs, assuming the similar accelerationmechanism with solar eruptions.

APO & SMARTS flare star campaign observations I. Blue wing asymmetries  in chromospheric lines during mid M dwarf flares from simultaneous  spectroscopic and photometric observation data