 While "Viper" is Sogna's leading series, there are other titles garnering recognition as well.The "Animahjong" series, which shortly preceded the "Viper" series, was Sogna's first series of bishōjo games.One more title was produced in the middle of Sogna's lifespan called "Galactic Guardian Guynarock R", which was a brief story set in space with an all-female space station crew who are attacked by powerful aliens.