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.
Command noticed an anomaly in their Slipgate network. After sending a few scouting parties into the anomaly, none of which have returned, they are starting to fear the worst. They sent you in to investigate the anomaly and report your findings upon your return.
This time Duke is sent to some sort of a submarine base. The alien vermin has taken over a fortress by the sub base and it's your job to cleanse 'em out.