Kabayama Atsushi was a child prodigy, but now he&rsquo;s just a regular high school boy.  One day, a mysterious man from another world named Trance appears before Atsushi and asks for his cooperation.  Apparently Atsushi is the chosen person who can save the world&mdash;by sleeping with Trance&rsquo;s &ldquo;sister,&rdquo; Tsubasa!  Already confused and overwhelmed, Atsushi is also targeted by a woman with strange powers that seems to know Trance and is determined to kill Atsushi.  Does the world&rsquo;s fate really depend upon Atsushi having sex with Tsubasa?

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