Viper M1

Viper M1 is an instalment in the Viper series of interactive adult visual novels. It contains three stories to play through: Green Boy, The May Works, and My Mothers. All three stories are fully-animated and have full Japanese voice acting. At regular intervals, the player is tasked with making a decision that will determine where the story goes.

Green Boy is told from the perspective of Natane, a young woman who runs a flower shop with her older sisters Kazumi and Namiki. One day, a man arrives who leaves a seed in the shop before disappearing. To the sisters' surprise, the seed grows into a naiive green-haired boy, and they realize it has been left up to them to make him into a man.

The May Works follows Maki, a schoolgirl who is accosted by a pair of strange-looking aliens, a hard-bodied alien named Kabuto and a gelatinous alien named Slamy, who are engaged in a contest to determine whose physiology is superior. Unfortunately for Maki, the aliens have decided that the winner of the contest will be whoever can rape her first. The player controls Maki from a top-down perspective in a town map as she runs for safety, with the place she ends up hiding determining the kind of ending the player gets.

The protagonist of My Mothers is Mika, a young woman with an eccentric grandfather who wants her to fight crime using a powerful suit that he has created for her. Mika rebuffs the idea and storms off, angry that she might have been made late for her date, but upon arriving at the park where she was supposed to meet her date, she finds that he has been kidnapped by a dominatrix, causing her to reconsider her grandfather's proposal.