Doujima Nanako♀

Nanako is Ryoutaro's daughter and Yu's kind-hearted cousin. Her mother died in a hit and run when she was young, and thus all the household chores fall to her, but despite her age she does an admirable job managing both the cooking and cleaning after school. Due to this, she is quite mature for a girl her age though has moments of childish innocence. She loves Junes, in both its slogan and in visiting their Inaba branch with her family and friends. She tends to be shy around strangers, but adores spending quality time with her father and cousin whenever possible. As she develops more trust in her older cousin, she begins calling him "onii-chan" as if he really was her older brother. Although she harbors a great love for her father, she sometimes questions his love for both her and Chisato, her late mother.

[Edited from Megami Tensei Wiki]