Yandere Simulator is an upcoming stealth action video game for PC developed independently by Alex Mahan (YandereDev).

[3][4] The game centers upon an obsessively lovesick schoolgirl named Ayano Aishi, nicknamed "Yandere-chan", who has taken it upon herself to eliminate anyone she believes is attracting her "senpai's" attention.

[5] Beginning development in 2014, Yandere Simulator achieved a considerable amount of attention online the following year, leading to millions of downloads of pre-release versions of the game, as well as crossovers and spin-offs.

The player has the ability to kidnap, torture, poison, electrocute, matchmake, befriend, betray, frame, and drown rivals, befriend other schoolmates, play small mini games, access a street where the player can earn money by playing a maid café minigame, spend money at shops to buy different types of items, and more.

[20] On November 16, 2016, a spin-off Metroidvania game titled Yandertale was released; a parody of Undertale, it follows Ayano Aishi as she fights Oka Ruto in Sans-inspired battle.

[7][17][16] LoveSick, a web series adaptation of Yandere Simulator written and directed by Abby Roebuck, animated by Sakura Media with permission from YandereDev, and sponsored by Amino, aired for nine episodes from June 6, 2017 to January 24, 2020.

[34] A spin-off manga series based on Yandere Simulator: Mission Mode and entitled Nemesis: Retribution, written by Alex Mahan and illustrated by Vanelover and JIBJAB, was published from August 1, 2019 to March 19, 2022.

(Monika, Sayori, Yuri, and Natsuki) were added to Yandere Simulator as playable character skins for Ryoba and Ayano Aishi, with permission from Team Salvato.

On December 28, 2019, it was announced the characters from Yandere Simulator would be added as playable characters to the puzzle and action role-playing game Project QT early the following year, with Ayano Aishi (renamed Patti in a 2023 update) and Info-chan (renamed Emily in a 2023 update) ultimately being chosen via poll, with Michaela Laws and Cayla Martin reprising their roles.

[42][43] On June 24, 2020, Yandere-chan (Ayano Aishi) and Nemesis (Hanako Yamada) were added as playable characters to the French third-person shooter game BITC (Boobs in the City), with Michaela Laws and Dawn M. Bennett reprising their roles.

On June 28, 2023, a Yandere Simulator DLC was added to the multiplayer horror party game Dark Deception: Monsters & Mortals by Glowstick Entertainment, featuring a Yandere Simulator map with Fun Girl as the boss of Boss Time, Police Officers as the bosses of Trap Time, as well as Senpai (Taro Yamada), Info-chan, and Nemesis (Hanako Yamada) as playable mortal characters, and Ayano Aishi as a playable monster character, with Austin Hively, Cayla Martin, Dawn M. Bennett, and Michaela Laws reprising their roles, Bennett via archival audio.

[46] In their 2022 doctoral dissertation, Kristian A. Bjørkelo noted that some hearing about or playing the game found it transgressive due to the themes of sexuality and murder, while others took more exception to an update that would allow players to kill cats as a way of avoiding police detection.

"[20] In January 2016, Yandere Simulator was added to the list of banned games by Twitch for violating the streaming service's policies on extreme content.

Mahan was a vocal critic of the ban, claiming that Twitch never explained what prompted its addition to the list and that he would have been willing to "modify minor, innocuous things that were never meant to be the focus of the game, but I would not be willing to remove gameplay mechanics, remove core features, or change the focus of the game",[8] further criticizing the ban as a result of "self-righteous ideologies".