The third born. A 23 year old (44 in Gokaiger) Math teacher skilled in fencing. Calm and intelligent, she can analyze and calculate with her "computer like" brain. She was 3 years old at the time of the attack on Sidon and remembers nothing but fear which she had to overcome to do battle with Zone as an adult. Protective and caring, she is a maternal figure to her younger siblings.

In Episode 18, Kazumi injures her left arm from getting hit from Butarugin's long rake. She was seen training her reflexes on her injured left arm by getting a tennis ball but this fails when her arm injury causes pain. Kazumi also risking her life for Hiroshi (who always get caught by her because of his knack of getting money) to escape as her injured left arm was stepping on by Butarugin.

After being attacked by Butarugin, she and her siblings as Fivemen are soon rescued by Hiroshi in his pig face form who manages to throw all of his expenses from his piggy banks and the bills he took from Butarugin making the former to show its gluttonous side for money allowing Kazumi to transform as FivePink to fight it. Despite her injury, she finally displays her fencing abilities to defeat Butarugin.