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[DeepL Translation - needs review] Atsushi Kabayama was called a prodigy when he was younger, but now he's just an ordinary high school student. One day, a mysterious man named Trance appears before him, a human from another world who demands that Atsushi have a physical relationship with his sister, Tsubasa, or the world will be destroyed. Atsushi doesn't understand English. On top of that, a woman called Alias begins to target Atsushi's life... The collapse and survival of the world depend...