VNDB (http://vndb.org/v3420)
(http://sognadigitalmuseum.com/images/photos/products/games/m1.jpg)
Sogna combined the best of both worlds in VIPER-M1: a modern, Windows-based interface and a set of three smaller games, reminiscent of the earlier V series titles. Super-heroine story My Mothers features cover girl Mika in her attempt to rescue a prospective boyfriend. Coming of age tale Green Boy follows Natane and her two older sisters as they welcome a strange young man into their home. The May Works focuses on a schoolgirl, Maki, as she flees from an alien invasion of her hometown.
This is the International release version. Because of the original media (and possibly for still being in the Japanese market), the H-scenes are still censored.
Mediafire links:
http://www.mediafire.com/file/00vsfvtfrttt81s/Viper_M1.part1.rar (http://www.mediafire.com/file/00vsfvtfrttt81s/Viper_M1.part1.rar)
http://www.mediafire.com/file/gqq4jdioz5s3dq9/Viper_M1.part2.rar (http://www.mediafire.com/file/gqq4jdioz5s3dq9/Viper_M1.part2.rar)
http://www.mediafire.com/file/iinbcxyty94163b/Viper_M1.part3.rar (http://www.mediafire.com/file/iinbcxyty94163b/Viper_M1.part3.rar)