Miko Yotsuya is the main character of the series Mieruko-chan. She has the ability to see spirits, even very powerful ones that are invisible to other mediums, with total clarity. This ability is active constantly, so she always sees spirits in her day-to-day life, and due to their terrifying appearance and threatening behavior, she constantly fears for her life. She has noticed that if she doesn't acknowledge them, spirits will not bother her, so she must remain stoic and unflinching in the face of supernatural terrors, though her act crumbles as soon as she feels safe.

(Source: Mieruko-Chan Wikia)