Nanami lost her mother when she was very young, which shaped a lot of who she became. For years afterward, she threw herself into being a mother figure for her younger sister Rumi—so much so that she basically had no time for anything else at school, not even clubs or activities. She was classmates with Tsubomi and Erika, though you wouldn't necessarily know it given how isolated she kept herself.
Eventually though, she found a better balance. She realized she could look after Rumi and have a life of her own. That shift led her to the Fashion Club, where she started actually engaging with school life and her peers. Fans often note that this change showed real character growth—she didn't abandon her responsibilities, but she stopped letting them consume her entirely.
Content compiled by AnimeList.moe from publicly available sources.
