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The Tatami Galaxy (Japanese: 四畳半神話大系, Hepburn: Yojōhan Shinwa Taikei, lit. "4½ Tatami Mythological Chronicles") is a 2004 Japanese varsity novel written by Tomihiko Morimi and published by Ohta Publishing. Its first-person narrator is an unnamed upperclassman at Kyoto University reminiscing on the misadventures of his previous years of campus life, with each of the four chapters taking place in parallel universes in which he is enrolled in a different student society.