Nagomi is often shown to be very stern with Kazuya, though she admittedly has spoiled him since he was her only grandchild child. When Kazuya falsely declared that he has Chizuru as his girlfriend, Nagomi is so proud that Kazuya able to get an angel despite his appearance. Ironically, Nagomi also a crybaby when she played the similar game that Kazuya had played and often to share her problem when she was online in the game.
Nagomi is displayed to be overbearing but supportive to her children, and they are often concerned when she acts brazen in spite of her health. When Kazuo first dated Harumi, Nagomi did some outrageous things, such as barge in on Harumi's job and accompany them every third date. However, Nagomi became their emotional pillar when they had trouble conceiving a child.
Nagomi absolutely adores Chizuru and fawns over here at every opportunity. From the moment she was introduced, she cherishes Chizuru as her own grand daughter, despite not noticing yet that Chizuru is a rental girlfriend.
Nagomi was initially unsure of how to deal with Ruka and just tolerated her due to Kazuya's lie. However, she has opened herself up to Ruka's sweetness and believing she is Chizuru's friend.
Mami secretly followed her twitter account as her step to break Kazuya and Chizuru. Personally, Nagomi is in good relations with her and Mami seems to respect her. It is yet to be revealed on how Nagomi will face her indirectly.
Nagomi has a good friendly relationship with Kibe and respects his skills with electronics. Likewise, Kibe greatly respects her.
Because of Nagomi's daily life lead her to be hospitalized, she managed to make friends in there.
One of the only revealed acquaintance of Nagomi. They have become good friends, and have gotten even closer when Kazuya and Chizuru were revealed to be a couple. Nagomi is aware of Sayuri's failing health and pities Chizuru for having to endure the rest of her life without a family.