Nanami has been shown to be a very outgoing and cheerful girl, but when it comes to Yūna Matsubara, she can be either very weak or very dominant. She is deeply in love with Yūna, to the point she might commit suicide if Yūna leaves her, as stated in the extra light novel. She is also shown to be very weak-willed, as mentioned when her mother bought a large cake to celebrate her getting accepted in St. Michael's, she apparently ate three pieces, stating that "Cake to Girls, is like Catnip to Cats