Yuuko Hattori

Yuuko Hattori (服部 ゆう子Hattori Yūko) or Yuri Hoshino (星野 ゆり / Hoshino Yuri) is Junko Hattori's younger sister who lives a double life as the popular teen idol Yuri Hoshino. She was bitten by a demon in her younger years, and bears a scar on the left side of her neck. It reacts to a demon beast's mana whenever she is near one, causing her to be in pain. Despite this, she is very eager to beat them whenever she encounters one.