"She was the only exception among the humans he loathe so much." Warning: Mature themes, health problems, toxic relationship, slight yandere tendencies, angst, violence and gore. Naomi Ubuyashiki is Kagaya's younger sister who has the unique ability to tell whether someone is a demon by looking at their eyes. Coincidentally, she can also tell whether they are lying or not. Born in a cursed family and with a short lifespan due to her sickness, Naomi grew up to be adventurous and rebellious. Sneaking out at night was a habit she always does but a fateful encounter with a demon changes everything.