Yoshi's Racing Story V0.4 is likely a homebrew, fan-made, or a ROM hack built on the Yoshi's Story engine. The version number (V0.4) indicates an early or unfinished stage of development.  Its gameplay probably involves racing with Yoshi and characters from the Yoshi's Story universe, building upon that title's foundation.  Further specifics require more investigation into the Nintendo 64 homebrew scene.

Yoshi's Racing Story V0.4

Yakouchuu II - Satsujin Kouro (Japan)