Origin
Japan
"Osoro is the leader of the school's gang of delinquents. Very little is known about her past, or her goals. She has been known to be violent, so most people tend to stay away from her out of fear. Osoro will be absent from school for a very long time, and will not make her appearance until the eighth week of gameplay. Against all odds, she will develop a bond with Senpai, who normally keeps his distance from people like Osoro. Senpai and Osoro are polar opposites - so, what kind of experience could possibly cause them to form a friendship? What does Senpai know about her? What does he see inside of her? And what could stop their friendship from blossoming into something deeper?"
Yandere Simulator
Yandere Simulator is a stealth game about stalking a boy and secretly eliminating any girl who seems interested in him, while maintaining the image of an innocent schoolgirl. The game is currently under development, and a free debug sandbox build is available from the developer's official blog and website. The protagonist of the game is a high school student known as Yandere-chan who has fallen in love with an upperclassman known as Senpai. Yandere-chan cannot bear the thought of Senpai in another girl's arms, but she is too shy to confess her love to him, so she must resort to sabotaging his love life from the shadows. Once every week, a new rival girl will fall in love with Senpai. Each rival must be eliminated within 5 days, or else she will confess her love to Senpai, which will result in a Game Over. If Yandere-chan is arrested, expelled, or obtains a bad reputation, the result is an immediate Game Over. Rivals can be eliminated with lethal methods such as poisoning and electrocution, or eliminated with non-lethal methods such as kidnapping or matchmaking with other NPCs.
