An eroge and bishoujo game series by Sogna.

Titles

• Viper V6
• Viper V8
• Viper V10
• Viper GTS
• Viper V12
• Viper V16
• Viper BTR
• Viper CTR
• Viper F40
• Viper M1
• Viper Island Vol.1-6
• Viper F50
• Viper GTB
• Viper Paradice/Viper Langerie Black, Viper Purple and Viper Red
• Viper GT1
• Typing ViperViper Typing
• Viper M5
• Viper RSR
• Viper M3
• Viper V6R
• Viper V8R

Viper GTS was made into a three part hentai anime series in 2002 by Studio G-1 Neo.

Other titles from Sogna

• Galactic Guardian Guynarock R
• Animahjong

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