Kimajime na Kanojo ga Koi ni Ochiru made

Rio Ichikawa has always been a serious person and has never been good at getting involved with other people since she was a child. One day, Rio is secretly excited when she is assigned to work on the same team with Nanase, a man who looks exactly like her ideal boyfriend who appeared in her dream. However, she is disheartened when Kato, another team member, and a client call her "serious" about her personality, which she is concerned about. Rio returns home depressed, and accidentally hugs a soaking wet man in front of her apartment building...?