The protagonist, a university student named Yuji Shibata, encounters a naked girl crouching in a garbage dump one night. The girl has animal ears and a tail, unlike a human, and she has lost her memory. The protagonist names her "Mii" and takes her in, helping her to regain her memory. Who exactly is she?

This game is a remake of "Radical Sequence" the first in the Gao Gao! Series released by Four-Nine, consisting of 8 chapters and progresses as a traditional ADV where you make choices. the game featured command selections like "look" and "talk," like many other PC-9801 ADV but in this revamped entry commands have been removed for smoother progression.