 If you liked
Serial Experiments Lain
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 ...then you might like
Key the Metal Idol
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These two titles share psychological themes, ideas about reality, existence, soul, identity and humanity and its' connection to modern society and technology. Looks like Key is the predecessor to all anime that raise spiritual queries.
<i>Lain</i> explores similar themes– human relationships, deception, isolation, and complication– in a similar subtle, surreal way.
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Recommended by egg_of_lilith
Serial Experiments Lain is the (improved) spiritual successor of Key the Metal Idol. Expect similar themes and storytelling devices.