Yamibami

Ayakashi. Since ancient times, they are monsters born as parasites that prey on the "weakness" of the human heart. Kisaragi, a demon who enjoys feeding on such creatures, is a school nurse and is waiting for an opportunity to infest a student with ayakashi. Tamura Mio is the most beautiful girl in school. She has an obsession with her appearance, and the shadow of ayakashi is approaching her...

Ayakashi can infect your heart too... A dark horror lurking in the modern world!

(Source: Hakusensha, translated)