If you liked
ChäoS;HEAd
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...then you might like
ChäoS;Child
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Chaos;Child is the thematic sequel of Chaos;Head. Both are in the series called Science Adventure, also Steins;Gate (which you probably watched), Robotics;Notes and Occultic;Nine, so go check those out too. They all happened in the same universe so the settings, the suspense feelings, the mystery solving, all that.
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Recommended by pirurupurara