What is "Yandere Simulator", anyway??

Yandere Simulator (possible working title) is a stealth action video game currently in development and to be published by YandereDev. The game centers upon a love-sick schoolgirl nicknamed 'Ayano Aishi', and better known as 'Yan-chan' after the Japanese term "yandere", who has taken it upon herself to eliminate anyone she believes is monopolizing her crush's attention.
Gameplay: Players control Ayano Aishi, a Japanese schoolgirl who has developed a crush on a fellow student when she bumped into the boy currently named Taro Yamada, nicknamed "Senpai". Over the course of 10 weeks, 10 rival students develop crushes on Senpai, and Ayano must prevent them from confessing their love to him. Due to her 'yandere' nature, this can be accomplished by the player via several methods such as murder, blackmail, or social sabotage. Throughout the game, Ayano can receive aid from an information broker calling herself "Info-chan", who can provide her with services such as weapons, plans, or other favors in exchange for panty shots. Ayano must also avoid being witnessed while performing criminal activities, or suffer penalties ranging from a loss in reputation that makes it harder for other students to trust her to an immediate game over. During this time, she can join school clubs and attend classes to receive additional abilities such as easy access to weapons or increase abilities to avoid suspicion. 
About the developer: YandereDev is an independent game developer in California, and has worked at a video game company for three years. In April 2014, YandereDev pitched the idea for Yandere Simulator on 4chan, where it got a lot of positive reception, so he decided to start developing it.

                                    YandereDev and Midori Gurin- one of Yandere Sim characters.

It is a social stealth game that borrows elements from the Hitman series, but also contains "school simulation" gameplay and other elements that make it quite different from Hitman. Development for Yandere Simulator began in 2014, with YandereDev releasing test builds of the game for debugging purposes. He has periodically released updates that add elements to the game, such as the ability to poison, electrocute, and drown rivals, stealing other female students' uniforms to change into after committing a murder, befriending other schoolgirls, small mini games, a town the player can bike around in, and more.The game is planned to be released in 2019.
                                                                                                                                          ^^Wikipedia