This allows ffmpeg to capture without any audio or video desynchronization, but it seems that OBS has even less latency and no desync, so it might be a better option.
ffplay \
-rtbufsize 256M \
-use_video_device_timestamps 1 \
-f dshow \
-pixel_format yuyv422 \
-sample_rate 48000 -channels 2 \
-i video="MiraBox Video Capture ":audio="マイク (MiraBox Audio Capture )"