Kasumi Kagami is the 16-year-old elder sister of Kazuya Kagami, a second-year high school student renowned for her beauty, competence, and gentle nature.
A strikingly beautiful and responsible young woman, Kasumi is exceptionally kind-hearted.
Beneath her caring exterior, however, lies a severe brother complex, affectionately referring to Kazuya as "Yak-kun."
After the death of their mother, Kasumi took on the full responsibility of managing all household chores.
Her everyday school-life demeanor gives no hint of her hidden power.
In reality, Kasumi is the owner of the Tsugumomo named Sunao Sumeragi.
She is celebrated as an exceptionally talented Tsugumomo user, called a "once-in-a-decade prodigy."
Driven by a desire to protect Kazuya, she willingly sought rigorous training from their mother during her childhood.
Kasumi views her training not as cultivation but as sheer torment.
Her mother, Kanaka, subjected her to brutal ordeals, including hurling multiple massive boulders and being chased by a creature resembling an Amasogi.
She harbors a long-standing grudge over these traumatic experiences, bluntly calling her revived mother an "old hag."
When Kanaka nearly kills Kazuya, Kasumi intervenes decisively alongside Sunao Sumeragi to save him.
Sacrificing three years of her time, she casts a powerful barrier to imprison Kanaka, buying precious time for the battle.
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