Yuki, a working adult still harboring a complicated first love for his older brother, uses dating apps to enjoy one-night stands to fill the loneliness in his heart. One day, he finds someone who resembles his brother. As usual, they have a great time, but then he realizes that he has accidentally had sex with his er brother's son—his own nephew, Junya—and he is thrown into a panic! On top of that, Junya confesses that he has "always loved him" and tells him that he can "think of it as being held by his father," and Yuki finds himself overwhelmed by pleasure again and again...!?