Unlike Takumi Nishijou her bigger brother, Nanami is a very kind, open and outgoing girl who lives a normal high school life, such as being involved in the school’s extracurricular activities like tennis. She is shown to care a lot for Takumi as she often checks up on him and gives him advice, trying to get him out of his secluded lifestyle, but is easily upset when he does not reciprocate her affection, treating his younger sister very coldly like she is a nuisance.