Pictures are individual frames of animated scenes in the game (extracted from the game files).

You can create a video of it with the following command and ffmpeg installed:
Yoichi2: ffmpeg -framerate 15 -i yoichi2_final-%3d.png -c:v h264 -pix_fmt yuv420p Yoichi2.mp4
Yoichi3: ffmpeg -framerate 15 -i yoichi3_final0%3d.jpg -c:v h264 -pix_fmt yuv420p Yoichi3.mp4

I will be happy to post more scenes on request.