Daichi returns home tired from work, when the man he helped in the park that morning suddenly steps in! Moreover, the man claims to be an 'incubus born of darkness' and collapses on the doorstep again. Daichi is torn between his anxiety about the man claiming to be a demon and his feelings for the fallen man, but he also discovers the shocking fact that he must be made to drink semen in order to save him. ......! 仕事で疲れて帰宅した大地の元に、朝公園で助けた男がいきなり踏み込んできた！ しかも、その男は『闇から生まれた魔物』だと名乗り、再び玄関先で倒れこんでしまう。 魔物だという男に対する不安と、倒れこんだ男に対する情で揺れ動く大地だが、救うためには精液を飲ませなければならないという衝撃的な事実も発覚して……！？