The most recognizable element of Kaori’s character is her "Hammer Punishment." Whenever Ryo behaves inappropriately toward a female client (his infamous "mokkori" behavior), Kaori produces a massive mallet—often labeled "100t"—out of thin air to flatten him.

The "full" Kaori Saejima experience is incomplete without discussing her slow-burn romance with Ryo. Unlike typical shonen or seinen romances, theirs is built on professional trust and unspoken protection.

Kaori Saejima is the younger sister of Hideyuki Saejima, a former police detective and Ryo Saeba’s original partner. On her 20th birthday, Kaori learns a shocking truth: she was not biologically related to Hideyuki but was the daughter of a criminal he had chased, adopted into the Saejima family as a child.

Tragedy strikes when Hideyuki is murdered by the Union Teope cartel. In his final moments, he asks Ryo to look after Kaori. Stepping into her brother’s shoes, Kaori joins Ryo to form the new "City Hunter" duo, handling the administrative side of the business while keeping Ryo’s lecherous tendencies in check. 2. The Dynamics of the 100-Ton Hammer

He views Kaori as his "glass heart"—too precious to be tainted by the violence of his world, which is why he often hides his feelings behind jokes.

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