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Sogna is a brand of Silence, under which they developed and published adult games. Like the non-adult branch, Sogna was founded and led by the animator KenichirĊ Nakamura. They are best known for their animated Viper series.


Viper Paradice(2000)
Viper CTR: Asuka(1997)
Viper BTR(1996)
Viper V-16(1995)
Viper V-12(1995)
Animahjong X Perfect(1994)
Viper GTS(1994)
Animahjong X(1994)
Viper V-10(1994)
Viper V-8(1993)
Viper V6(1993)
Animahjong V3(1993)


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