 If you liked
Mirai Nikki
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 ...then you might like
Cock Robin wo Korosu no wa
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Mirai Nikki is very similar. Both protagonists are cowards bitching about everything, annoying as hell, both have "psychopath girls" protecting protagonist, and main plot is almost identical, you have to kill every participant of the game to win and become "God"(in Cock Robin it's fulfilling one wish)