Yuko Yoshida (吉田 優子 Yoshida Yūko)/Shamiko (シャミ子) is the protagonist of Machikado Mazoku. She is a 15 year old high school student of Sakuragaoka High School who, one day, wakes up with horns and a tail. Upon learning from Seiko Yoshida that she is a descendant of the cursed Dark Clan, she is tasked to defeat a magical girl and obtain her blood to break the curse, especially her family's curse of having to live under 40,000 yen per month.

She is from Anime "The demon next door".