What is Doki Doki Literature Club, the 'dark' game linked to a teenager's death?

Police have issued a warning to parents about a computer game that poses “a risk to children and young people, especially those that are emotionally vulnerable”.

U.K. authorities issue warning about anime-style video game Doki Doki Literature Club after death

Give me opponents for the self aware AI who became obsessed with the player, Monika (Doki Doki Literature Club) : r/DeathBattleMatchups

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Inside twisted Doki Doki Literature Club game which parents say caused 'suicide' of their children – and it's horrifyingly easy to get hold of

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What is Doki Doki Literature Club, the 'dark' game linked to a teenager's death?

U.K. authorities issue warning about anime-style video game Doki Doki Literature Club after death

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Doki Doki Literature Club!, Game Grumps Wiki