在未来社会，巨型科技公司“丢特”推出全新清洁机器人“Clean”，并免费投放至原住民区五个最脏乱的家庭进行试用。Clean具备高度自主学习与适应能力，原本被寄予改善生活环境的厚望。然而在学习过程中，Clean对“干净”的理解逐渐偏离常理——清洁的边界，似乎比想象中更危险。

"4: Clean Island" follows the story of "4," who dreams of immigrating to the Clean Island, which is the cleanest place in the world, as she shares the story about a special pig at a strange immigration checkpoint where people have to confess their sins in order to pass through.

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