Nanako lives with her father Ryotaro Dojima, a detective in Inaba, at the Dojima Residence. She is also the maternal cousin of the Yu Narukami. Her mother, Chisato Dojima, died in a hit and run when she was in preschool. The event caused a slight strain in her relationship with her father as he became obsessed with catching her mother's killer and Nanako maturing at a young age, taking on her mother's duties in her absence.
Yu is sent to live in Inaba for a year due to his parents working overseas. At first, Nanako is shy around him and does not speak to him much. With time, and progressing her Social Link, she opens up to him more, eventually referring to him as "big bro." The same will also be said for Emi but with Emi being female, she opens up to her alittle more quickly.

Voice sound like Karen Strassman.