Machi is Ayane's older sister. She may look innocent, but she is actually something of a sadist. She enjoys torturing people with her voodoo doll—especially her little sister—enjoying their pained expressions. Whenever she has to get things done, she tends to use the most dangerous way to do so.

She has a weakness though: her age. Machi is very sensitive about it so whenever someone calls her old, she gets a shock. Machi has an eye on Ikuto because of that, thinking she should be getting married soon.