Riginetta, who proclaims herself as the most beautiful and intelligent robot girl, bought an island for a mere 100,000 yen, feeling very fortunate to acquire her new property. Now she is heading to her island for a vacation, however, she realizes that the place is infested with sensual monster girls with whom she will have to deal with, either by defeating them in combat or through sexual encounters.

Based on the erotic doujin game by Watashi ga Ichiban Kawaii (私が一番かわいい).