Yandere Simulator is a popular simulation game where you play as a high school student who becomes a yandere (a character archetype in Japanese media that is obsessively in love and often violent). Your goal is to eliminate your rivals and confess your love to the object of your affection without getting caught.
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While the original game isn't on mobile, several similar "yandere-style" games are available for Android through Uptodown: yandere simulator download android uptodown