A beautiful succubus descends into the life of a dull middle-aged virgin! She's so flawless and beautiful! It's like a two-dimensional world! But this is reality... The middle-aged man is at the mercy of the little devil Mitsuki's tsundere attacks, which can be adjusted to suit her needs! He can't produce any more semen! Who would have thought he would have such a luxurious problem?! What will happen to this man who has fallen in love with a non-human being?!