A smoke-born yokai depicted by Toriyama Sekien in Konjaku Hyakki Shūi. The “ra” in its name refers to a thin gauze, evoking a spirit of smoke that drifts like sheer fabric. Rooted in the age-old sense of presence within hearth and stove smoke, it appears as a formless, drifting entity. In sources, Sekien’s illustration is the primary standard; no specific harm or blessing is defined, and it’s understood as the very essence of smoke made animate.