折り鶴に宿っていた何かが、長い年月を経て異形化したとされる存在。

大人しく、川や湿地を漂うようにゆっくりと移動する。

かつては小さな折り鶴に過ぎなかったが、現在では著しく巨大化・異形化している。白い紙のような身体と独立した頭部を持ち、それらは紐のようなものによって繋がれている。

An aberration believed to have originated from something that once resided within origami cranes, gradually transforming over the course of many years.

Generally docile in nature, Setsuu drift slowly through rivers and wetlands as though carried by the current.

Though they were once no more than small origami cranes, they have since undergone significant growth and transformation. They possess bodies resembling white paper and a detached head, the two connected by cord-like strands. The exact nature and purpose of these strands remain unknown.

​