A high-speed imaging system for observing solar flares in the continuum and H $ \alpha$ wavelengths was installed on a $ \phi$ 25 cm telescope of the Solar Magnetic Activity Research Telescope (SMART) at Hida observatory of Kyoto University. The aim of this system is to diagnose the spatio-temporal evolution of high-energy particles in solar flares by capturing the explosive evolution of chromospheric and photospheric flare kernels. The system acquires flare images covering a field of view of 344 $ ''$ $ \times$ 258 $ ''$ with a spatial sampling of 0 $ \hskip1pt''\!\!\!.\hskip1pt$ 215 pixel $ ^{-1}$ and a frame rate of 25 frames s $ ^{-1}$ . Initial data, including two white-light flares, demonstrate the diffraction-limited performance of the system. Observations have been in regular operation since 2011 November. The system is expected to provide a data set that is highly complementary with Hinode/SOT, SDO/AIA, and other ground-based instruments for upcoming solar-flare research.