The foundation beneath the skin. Muscles that sustain circulation and response.

Overview

The layer of facial muscles located just beneath the skin, influencing blood flow and firmness.
Within the saga, they are symbolically referred to as “the foundation that allows the skin to let things through.”

Origin & First Appearance

• First appearance: *Dialogue with the Spirits of the Skin* Season 1, Episode 2
• Related: [Skin Microbiota](/en/glossary/microbiota/)

Examples / Scene Depiction

• The spirit explains: “When they weaken, no matter how fine the substance, it will not pass.”