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This is the lesser-known companion Playstation game to the classic anime Serial Experiments Lain. There's a downloadable version as well. The bottom of this page has the chart of keyboard controls.
Also, the gameplay is highly unconventional. It's not like a regular visual novel. It has a totally different style and purpose and interface than Disco Elysium, but it takes the same sort of patience and open mindedness.
I think it's a separate continuity
Exactly right. It's another experiment in the series.