Yokokawa's ex-girlfriend, she meets the Oni-baku at the Valentine's Day Parade and takes a ride in their modified Koenig. She takes an interest in Eikichi and asks him to save her from Yokokawa.
Eikichi is later scared off upon meeting her three children, all of whom bear a striking resemblance to Yokokawa. Miki currently still stays in touch with Yokokawa while raising her children.