Niemiko

Sumika Yagatame, a high school girl whose family serves at a shrine, is able to see “strange things” that ordinary people cannot. She is constantly compared to her younger sister, who has stronger supernatural talent, and she is tired of being treated as a spare. One day, during the temple's monthly ritual of "prayers at full moon,” a demon that had been sealed inside her is unleashed, and they are in big trouble! But they are saved by a mysterious youkai that appears, who likes to call Sumika the “Sacrificial Princess”⁉

(Source: Comic Zero-Sum, translated)