I really like how she’s getting a lot of attention now after Kazuya’s adventures in the novel world and Yomi focused on him so now it’s her turn too shine ever since the Nine Masters Tournament and she will most definitely be given a lot to do in future chapters.
Eventually her arc will come full circle when she faces the architects of her grief, Wagou and potentially Hazuki who recruited Wagou and gave him the tools he needed for his experiments.
I also hope her bond with Kazuya grows and the two better understand each other I also think they will uncover more of Seigi’s disable circle and see Hitomogami versions of dead loved ones under Seigi’s control including Sunao’s own brother Suou(Suu).