Menreiki is a mask yokai recorded by Toriyama Sekien in Hyakki Tsurezure Bukuro. It represents the uncanny “living aura” of theatrical masks—particularly Noh and sarugaku masks—that have gathered spiritual energy over centuries. Rather than a monster with a fixed story, Menreiki is a pictorial yokai born from history, craftsmanship, and artistic imagination.

Sekien cites a legend that Hata no Kawakatsu, an early performer and mask-maker in Prince Shōtoku’s era, crafted masks so refined they seemed alive. This artistic vitality became the seed for Menreiki as a yokai concept.

In later periods, yes. Commentators reinterpreted Menreiki as a tsukumogami—old masks that, after long years of use, gain spirits, move by themselves, or voice resentment when treated poorly. However, in Sekien’s original depiction, the focus is artistic aura, not vengeance.

It is usually depicted as a cluster of masks acting with a single will, or a mask with a faintly human presence. The imagery evokes the feeling that old masks, when left in the dark, might whisper or shift as if breathing.

Rarely. Menreiki expresses resentment only when masks are handled roughly, neglected, or disrespected. Otherwise, they merely move at night, dance, or line up on shelves, showing the lingering spirit of performance.

Masks absorb the breath, sweat, prayers, and emotions of performers for decades. This accumulated ki (vital energy) makes them feel “alive,” especially in households or theaters that honor the arts. Menreiki reflects the belief that art itself gains a soul.

In families that practiced Noh or kept heirloom masks, they were: aired and purified on special days; stored in boxes with care; offered words of blessing. This was to calm their numinous presence and show respect to both the mask’s craft and spirit.

Not specific ones. Unlike yokai tied to a region, Menreiki is a conceptual, artistic yokai, created through Sekien’s imagination and cultural references. Its “sightings” are metaphorical—felt in the presence of ancient masks.

Because it resonates with modern interests in: tsukumogami stories; the eerie beauty of traditional Japanese masks; the idea that crafted objects have souls; It also appears in games, anime, and modern yokai guides as a symbol of the mystery of art.