Kuniko’s grandmother, the head of Metal Age. She places a firm emphasis on learning and is much sterner and reserved than Kuniko is. She wants Kuniko to become the next leader of Metal Age, but Kuniko does not want to be. She also disagrees with using the internet for information, and gets her knowledge from the many books she has.
Nagiko is actually the first CEO of Atlas Corporation and received funds from Sergei Talsian in order to build the futuristic city for their descendants. After Kuniko confronts her about this fact and receives no explanation, she is forced to expel her grandmother from Duomo. However, Nagiko reappears later on to help Kuniko to negotiate with Ryoko to grant temporary shelter inside Atlas for the inhabitants on the surface so that Metal Age can eradicate Daedulus by burning Tokyo down.