Hattori Haruka

She is the granddaughter of Hattori Sojiro, a knife craftsman who runs the cutlery workshop Ichimonji in Sakai, the city of knives.

With a bright, straightforward, big sister-like personality and a caring attitude, she is well-liked by people of all ages and genders and is usually surrounded by someone.
However, in reality, she has a nervous personality and is always concerned about what others think of her, and although she doesn't prefer solitude, she feels most comfortable when she is alone.

She admires her grandfather, who is a certified traditional craftsman, but his grandfather himself refuses to teach her anything, saying, "It's not a skill a woman can master, and there's no need for me to take over," so she secretly boards a train to train under a craftsman he knows, introduced to her by her father.