Manaka never had feelings for Ueno-kun, she only did it out of obligation to her friends, nothing more, it's when a classmate asks him to borrow an eraser from his classmate next door and then his friends tell him that you are already in love with that person, Manaka only remembers her ex-boyfriend because she felt pleasure and taste, she only uses Ueno-kun to forget her ex-boyfriend but in reality she still loves him and worse than that she left Ueno with him and left, so that he would tell her all the sex he had with her. When the author runs out of ideas, no way, I play NTR